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Monday, August 29, 2022

Dolphins form largest alliance network outside humans, study finds

UNIVERSITY OF BRISTOL

IMAGE: FOUR MALE ALLIES AND A FEMALE view more
CREDIT: SIMON ALLEN

Male bottlenose dolphins form the largest known multi-level alliance network outside humans, an international team led by researchers at the University of Bristol have shown. These cooperative relationships between groups increase male access to a contested resource.

The scientists, with colleagues from the University of Zurich and University of Massachusetts, analysed association and consortship data to model the structure of alliances between 121 adult male Indo-Pacific bottlenose dolphins at Shark Bay in Western Australia. Their findings have been published today in The Proceedings of the National Academy of Sciences (PNAS).

Male dolphins in Shark Bay form first-order alliances of two-three males to cooperatively pursue consortships with individual females. Second-order alliances of four-14 unrelated males compete with other alliances over access to female dolphins and third-order alliances occur between cooperating second-order alliances.

Co-lead author Dr Stephanie King, Associate Professor from Bristol’s School of Biological Sciences explained: “Cooperation between allies is widespread in human societies and one of the hallmarks of our success. Our capacity to build strategic, cooperative relationships at multiple social levels, such as trade or military alliances both nationally and internationally, was once thought unique to our species.

“Not only have we shown that male bottlenose dolphins form the largest known multilevel alliance network outside humans, but that cooperative relationships between groups, rather than simply alliance size, allows males to spend more time with females, thereby increasing their reproductive success.”

Dr Simon Allen, Senior Lecturer at Bristol’s School of Biological Sciences, who contributed to the study, said “We show that the duration over which these teams of male dolphins consort females is dependent upon being well-connected with third-order allies, that is, social ties between alliances leads to long-term benefits for these males.”

Intergroup cooperation in humans was thought to be unique and dependent upon two other features that distinguish humans from our common ancestor with chimpanzees, the evolution of pair bonds and parental care by males. “However, our results show that intergroup alliances can emerge without these features, from a social and mating system that is more chimpanzee like” noted Richard Connor, Professor Emeritus at the University of Massachusetts and now affiliated with Florida International University, who co-led the study with Dr King.

The publication of the importance of third level or intergroup alliances in dolphins in 2022 holds special significance as the team celebrate the 40th anniversary of the start of Shark Bay dolphin research in 1982 and the 30th anniversary of the publication in 1992 of their discovery of two levels of male alliance formation, also published in The Proceedings of the National Academy of Sciences.

Professor Dr. Michael Krützen, an author on the study and Head of the Anthropology Institute at the University of Zurich, added; “It is rare for non-primate research to be conducted from an anthropology department, but our study shows that important insights about the evolution of characteristics previously thought to be uniquely human can be gained by examining other highly social, large-brained taxa”.

Dr King concluded: “Our work highlights that dolphin societies, as well as those of nonhuman primates, are valuable model systems for understanding human social and cognitive evolution.”

Paper

‘Strategic intergroup alliances increase access to a contested resource in male bottlenose dolphins’ Stephanie L. King, Richard C. Connor, Michael Krützen, Simon J. Allen and William B. Sherwin in The Proceedings of the National Academy of Sciences.

CAPTION

Six allied males and female consort

CREDIT

Simon Allen

CAPTION

Male trio with female

CREDIT

Simon Allen

Contact

Stephanie King stephanie.king@bristol.ac.uk

Simon Allen simon.allen@bristol.ac.uk

Richard Connor rconnor@umassd.edu

JOURNAL

Proceedings of the National Academy of Sciences

METHOD OF RESEARCH

Data/statistical analysis

SUBJECT OF RESEARCH

Animals

ARTICLE TITLE

Strategic intergroup alliances increase access to a contested resource in male bottlenose dolphins

ARTICLE PUBLICATION DATE

29-Aug-2022

Inside the head of one of Australia’s smallest fossil crocs

Peer-Reviewed Publication

UNIVERSITY OF QUEENSLAND

Size comparison — IMAGE: CREDIT: JORGO RISTEVSKI view more
CREDIT: JORGO RISTEVSKI

Approximately 13.5 million years ago, north-west Queensland was home to an unusual and particularly tiny species of crocodile and now scientists are unlocking its secrets.

University of Queensland researchers have used state-of-the-art technology to reveal previously unknown details about the prehistoric Trilophosuchus rackhami’s anatomy.

Faculty of Science PhD candidate, Jorgo Ristevski said it is the most detailed examination ever undertaken of the skull anatomy of an extinct croc from Australia.

“By micro-CT scanning the beautifully preserved skull, we were able to digitally separate each bone,” Mr Ristevski said.

“We estimated that at adulthood, Trilophosuchus rackhami would have been between 70 and 90 centimetres long and weigh one to two kilograms, which was very small compared to most present-day crocs.

“This was a truly unique looking croc, with a short snout and three distinct ridges on the top of its skull.”

Trilophosuchus rackhami means Rackham’s three-crested croc, which was named in 1993 in honour of Alan Rackham, who now manages the Riversleigh Fossil Discovery Centre at Mt Isa.

Mr Ristevski said palaeoneurology, a field that studies the brain and nervous system of fossil species, can provide crucial insights into the animal’s evolution, morphology and even behaviour.

“For one of the studies, I digitally reconstructed the brain cavity of Trilophosuchus rackhami and found that it resembles that of some distantly related and potentially terrestrial extinct crocs from Africa and South America,” Mr Ristevski said.

“We were quite surprised to find this because evolutionarily speaking, Trilophosuchus rackhami is more closely related to today’s crocs.

“This may indicate that Trilophosuchus rackhami spent more time on land than most living crocs.”

Mr Ristevski said the findings would be useful in interpreting the evolutionary relationships of extinct crocs, something that will be researched in the future.

Associate Professor Steve Salisbury said up until very recently, Australia had an amazing diversity of prehistoric crocs.

“Trilophosuchus rackhami was certainly one of the cutest,” he said.

“If we could travel back in time to north Queensland 13 million years ago, not only would you need to watch out for crocodiles at the water’s edge, but you’d also have to make sure you didn’t step on them in the forest.”

Jorgo Ristevski

JOURNAL

The Anatomical Record

DOI

10.1002/ar.25050

ARTICLE TITLE

Cranial anatomy of the mekosuchine crocodylian Trilophosuchus rackhami

CRISPR CRITTER

CRISPR-based technology targets global crop pest

Designed to sterilize a fly species known to cause extensive crop damage, a new genetic technique replaces the need for harmful pesticides

Peer-Reviewed Publication

UNIVERSITY OF CALIFORNIA - SAN DIEGO

Fruit crop damage — IMAGE: THE INVASIVE DROSOPHILA SUZUKII FRUIT FLY HAS CAUSED MILLIONS OF DOLLARS OF DAMAGE TO BERRY AND OTHER CROPS. view more
CREDIT: MICHELLE BUI, UC SAN DIEGO

Applying new CRISPR-based technology to a broad agricultural need, researchers at the University of California San Diego have set their aims on a worldwide pest known to decimate valuable food crops.

Nikolay Kandul, Omar Akbari and their colleagues first demonstrated the precision-guided sterile insect technique, or pgSIT, in Drosophila melanogaster, the common fruit fly, in 2019. The technology, later adapted to mosquitoes, uses programmable CRISPR techniques to edit key genes that control sex determination and fertility. Under the new system, pgSIT-developed insect eggs are deployed into a targeted population and only sterile males hatch, resulting in a fertility dead end for that species.

Kandul, Akbari and their colleagues have now adapted the technology for use in Drosophila suzukii, an invasive fruit fly (also known as the spotted-wing drosophila) responsible for millions of dollars in crop damage. The advancement is described in the journal GEN Biotechnology.

“It’s a safe, evolutionary stable system,” said Akbari, a professor in the School of Biological Sciences’ Department of Cell and Developmental Biology. “Also, the system does not lead to uncontrolled spread nor does it persist in the environment—both important safety features that will help it gain approvals for use.”

D. suzukii flies have invaded many parts of the world and caused widespread agricultural and economic damage to several crops, including apples, cherries, raspberries, blueberries, strawberries, peaches, grapes, olives and tomatoes.

The flies are known to proliferate by depositing their eggs inside growing fruit. They are notoriously difficult to control since their larvae consume ripening fruit pulp, limiting the effectiveness of insecticide sprays. Some flies have been known to become resistant to insecticides and many chemicals used in insecticides are now banned because of threats to human health.

The concepts behind pgSIT date back to the 1930s, when farmers found ways to release sterile males into their crops to reduce damage from pests. By mid-century, United States farmers began using radiation to sterilize pests such as the New World screwworm fly.

With CRISPR, UC San Diego scientists avoided the need for harmful radiation and instead use CRISPR editing to specifically target genes essential for female D. suzukii viability and male fertility. As envisioned, pgSIT eggs could be produced at a factory and released at sites invaded by pests such as D. suzukii. Eggs could be deployed directly into areas where the flies are causing damage and only sterile males would hatch after about two weeks. Since only two genes are knocked out, the males emerge fit enough to compete with their wild counterparts and quickly seek females to mate with, resulting in inviable offspring.

“This technology would replace the need for insecticides and only suppress the target species population,” said Akbari. “In the last four years, we’ve developed pgSIT for several different species. Going forward we’re hoping to use it as a platform technology that can be ported to a whole range of pests to safely solve real-world problems.”

Agragene Inc., a private biotechnology company co-founded by Akbari, has licensed the pgSIT base technology from UC Riverside (where Akbari initially led the technology’s development) and is implementing U.S. Department of Agriculture-administered field trials of pgSIT in D. suzukii. The company hopes that the trials will demonstrate the safety and effectiveness of pgSIT and lead to regulatory approval of the technology for broad agricultural use.

The GEN Biotechnology paper was coauthored by: Nikolay Kandul, Junru Liu, Anna Buchman, Isaiah Shriner, Rodrigo Corder, Natalie Warsinger-Pepe, Ting Yang, Amarish Yadav, Maxwell Scott, John Marshall and Omar Akbari.

CAPTION

Former UC San Diego graduate student Stephanie Gamez created this artistic depiction of genetics and the fruit crop pest Drosophila suzukii.

CREDIT

Stephanie Gamez

CAPTION

Spotted-wing drosophila flies deposit their eggs inside strawberries and other ripening fruit.

CREDIT

Michelle Bui, UC San Diego

JOURNAL

GEN Biotechnology

METHOD OF RESEARCH

Experimental study

SUBJECT OF RESEARCH

Animals

ARTICLE TITLE

Precision guided sterile males suppress populations of an invasive crop pest

ARTICLE PUBLICATION DATE

18-Aug-2022

COI STATEMENT

Akbari is a co-founder with equity interest, and former consultant, scientific advisory board member and income recipient of Agragene Inc. Akbari and Kandul, who have submitted a patent application on pgSIT technology, are co-founders of Synvect Inc. with equity interest.

Compact QKD system paves the way to cost-effective satellite-based quantum networks

Researchers demonstrate successful quantum key distribution between space lab and four ground stations

Peer-Reviewed Publication

OPTICA

Space-to-ground QKD experiment — IMAGE: RESEARCHERS EXPERIMENTALLY DEMONSTRATED A SPACE-TO-GROUND QKD NETWORK USING A COMPACT QKD TERMINAL ABOARD THE CHINESE SPACE LAB TIANGONG-2 AND FOUR GROUND STATIONS. view more
CREDIT: CHENG-ZHI PENG, UNIVERSITY OF SCIENCE AND TECHNOLOGY OF CHINA

WASHINGTON — Researchers report an experimental demonstration of a space-to-ground quantum key distribution (QKD) network using a compact QKD terminal aboard the Chinese Space Lab Tiangong-2 and four ground stations. The new QKD system is less than half the weight of the system the researchers developed for the Micius satellite, which was used to perform the world’s first quantum-encrypted virtual teleconference.

The demonstration represents an important step toward practical QKD based on constellations of small satellites, a setup considered one of the most promising routes to creating a global quantum communication network.

“QKD offers unconditional security by using single photons to encode information between two distant terminals,” said research team member Cheng-Zhi Peng from the University of Science and Technology of China. “The compact system we developed can reduce the cost of implementing QKD by making it possible to use small satellites.”

Peng and researchers from other institutions in China describe their new system and experimental results in Optica, Optica Publishing Group’s journal for high-impact research. They also found that QKD performance can be boosted by building a network of satellites orbiting at different angles, or inclinations, in relation to the equator.

“Our new work demonstrates the feasibility of a space-ground QKD network based on a compact satellite payload combined with constellations of satellites with different orbit types,” said Peng. “In the near future, this type of QKD system could be used in applications that require high security such as government affairs, diplomacy and finance.”

Shrinking the QKD system

QKD uses the quantum properties of light to generate secure random keys for encrypting and decrypting data. In previous work, the research group demonstrated satellite-to-ground QKD and satellite-relayed intercontinental quantum networks using the Micius satellite. However, the QKD system used aboard that satellite was bulky and expensive. About the size of a large refrigerator, the system weighed around 130 kg and required 130 W of power.

As part of China's quantum constellation plan, the researchers sought to develop and demonstrate a more practical space-ground QKD network. To do this, they developed a compact payload that allowed the Tiangong-2 Space Lab to act as a satellite QKD terminal. The QKD payload — consisting of a tracking system, QKD transmitter and a laser communication transmitter — weighed around 60 kg, required 80 W of power and measured about the size of two microwave ovens.

“This payload was as integrated as possible to reduce volume, weight and cost while achieving the high performance necessary to support space-to-ground QKD experiments,” said Peng. “It also had to be very durable to withstand harsh conditions such as the severe vibration experienced during launch and the extreme thermal vacuum environment of space.”

The researchers performed a total of 19 QKD experiments during which secure keys were successfully distributed between the Space Lab terminal and four ground stations on 15 different days between October 2018 and February 2019. These experiments were conducted at night to avoid the influence of daylight background noise.

The researchers found that the medium (~42°) inclination orbit of the space lab allowed multiple passes over a single ground station in one night, which increased the number of keys that could be generated. They also built a model to compare the performance of satellite-based QKD networks with different orbit types. They found that combining satellites with a medium-inclination orbit like the space lab with a sun-synchronous orbit that travels over the polar regions achieved the best performance.

Next steps

The researchers are now working to improve their QKD system by increasing the speed and performance of the QKD system, reducing cost, and exploring the feasibility of daytime satellite-to-ground QKD transmission. “These improvements would allow a practical quantum constellation to be created by launching multiple low-orbit satellites,” said Peng. “The constellation could be combined with a medium-to-high-orbit quantum satellite and fiber-based QKD networks on the ground to create a space-ground-integrated quantum network.”

Although not part of this work, an even smaller quantum satellite developed by Hefei National Laboratory and University of Science and Technology of China and other research institutes in China was successfully launched into space on July 27. This satellite, known as a micro/nano satellite, weighs about a sixth the weight of the Micius satellite and contains a QKD system that is about a third of the size of that demonstrated in the Optica paper. That satellite is designed to carry out real-time satellite-to-ground QKD experiments, representing another important step toward low-cost and practical quantum satellite constellations.

Paper: Y. Li, S.-K. Liao, Y. Cao, J.-G. Ren, W.-Y. Liu, J. Yin, Q. Shen, J. Qiang, L. Zhang, H.-L. Young, J. Lin, F.-Z. Li, T. Xi, L. Li, R. Shu, Q. Zhang, Y.-A. Chen, C.-Y. Lu, N.-L. Liu, X.-B. Wang, J.-Y. Wang, C.-Z. Peng, J.-W. Pan, “Space-ground QKD network based on a compact payload and medium-inclination orbit,” 9, 8 (2022).
DOI: 10.1364/OPTICA.458330.

About Optica

Optica is an open-access journal dedicated to the rapid dissemination of high-impact peer-reviewed research across the entire spectrum of optics and photonics. Published monthly by Optica Publishing Group, the Journal provides a forum for pioneering research to be swiftly accessed by the international community, whether that research is theoretical or experimental, fundamental or applied. Optica maintains a distinguished editorial board of more than 60 associate editors from around the world and is overseen by Editor-in-Chief Prem Kumar, Northwestern University, USA. For more information, visit Optica.

About Optica Publishing Group (formerly OSA)

Optica Publishing Group is a division of Optica (formerly OSA), Advancing Optics and Photonics Worldwide. It publishes the largest collection of peer-reviewed content in optics and photonics, including 18 prestigious journals, the society’s flagship member magazine, and papers from more than 835 conferences, including 6,500+ associated videos. With over 400,000 journal articles, conference papers and videos to search, discover and access, Optica Publishing Group represents the full range of research in the field from around the globe.

CAPTION

Satellite-based QKD transmission could be used to create a highly secure global quantum communication network.

CREDIT

Cheng-Zhi Peng, University of Science and Technology of China

CAPTION

The researchers created the compact payload — shown here in ground experiments— that allowed the Tiangong-2 Space Lab to act as a satellite QKD terminal. It included a tracking system, QKD transmitter and a laser communication transmitter.

CREDIT

Cheng-Zhi Peng, University of Science and Technology of China

JOURNAL

Optica

DOI

10.1364/OPTICA.458330

ARTICLE TITLE

Space-ground QKD network based on a compact payload and medium-inclination orbit

'Everybody is happy now'

A world of genetically modified babies, boundless consumption, casual sex and drugs ... How does Aldous Huxley's vision of a totalitarian future stand up 75 years after Brave New World was first published, asks Margaret Atwood

British writer Aldous Huxley (1894 - 1963) sits with a newspaper on his lap, 1930s.

Photograph: Hulton Archive/Getty Images

Margaret Atwood
Sat 17 Nov 2007

"O brave new world, that has such people in't!" - Miranda, in Shakespeare's The Tempest, on first sighting the shipwrecked courtiers

In the latter half of the 20th century, two visionary books cast their shadows over our futures. One was George Orwell's 1949 novel Nineteen Eighty-Four, with its horrific vision of a brutal, mind-controlling totalitarian state - a book that gave us Big Brother and thoughtcrime and newspeak and the memory hole and the torture palace called the Ministry of Love and the discouraging spectacle of a boot grinding into the human face forever.

The other was Aldous Huxley's Brave New World (1932), which proposed a different and softer form of totalitarianism - one of conformity achieved through engineered, bottle-grown babies and hypnotic persuasion rather than through brutality, of boundless consumption that keeps the wheels of production turning and of officially enforced promiscuity that does away with sexual frustration, of a pre-ordained caste system ranging from a highly intelligent managerial class to a subgroup of dim-witted serfs programmed to love their menial work, and of soma, a drug that confers instant bliss with no side effects.

Which template would win, we wondered. During the cold war, Nineteen Eighty-Four seemed to have the edge. But when the Berlin Wall fell in 1989, pundits proclaimed the end of history, shopping reigned triumphant, and there was already lots of quasi-soma percolating through society. True, promiscuity had taken a hit from Aids, but on balance we seemed to be in for a trivial, giggly, drug-enhanced spend-o-rama: Brave New World was winning the race.

That picture changed, too, with the attack on New York's twin towers in 2001. Thoughtcrime and the boot grinding into the human face could not be got rid of so easily, after all. The Ministry of Love is back with us, it appears, though it's no longer limited to the lands behind the former iron curtain: the west has its own versions now.

On the other hand, Brave New World hasn't gone away. Shopping malls stretch as far as the bulldozer can see. On the wilder fringes of the genetic engineering community, there are true believers prattling of the gene-rich and the gene-poor - Huxley's alphas and epsilons - and busily engaging in schemes for genetic enhancement and - to go one better than Brave New World - for immortality.

Would it be possible for both of these futures - the hard and the soft - to exist at the same time, in the same place? And what would that be like?

Surely it's time to look again at Brave New World and to examine its arguments for and against the totally planned society it describes, in which "everybody is happy now". What sort of happiness is on offer, and what is the price we might pay to achieve it?

I first read Brave New World in the early 1950s, when I was 14. It made a deep impression on me, though I didn't fully understand some of what I was reading. It's a tribute to Huxley's writing skills that although I didn't know what knickers were, or camisoles - nor did I know that zippers, when they first appeared, had been denounced from pulpits as lures of the devil because they made clothes so easy to take off - I none the less had a vivid picture of "zippicamiknicks", that female undergarment with a single zipper down the front that could be shucked so easily: "Zip! The rounded pinkness fell apart like a neatly divided apple. A wriggle of the arms, a lifting first of the right foot, then the left: the zippicamiknicks were lying lifeless and as though deflated on the floor."

I myself was living in the era of "elasticised panty girdles" that could not be got out of or indeed into without an epic struggle, so this was heady stuff indeed.

The girl shedding the zippicamiknicks is Lenina Crowne, a blue-eyed beauty both strangely innocent and alluringly voluptuous - or "pneumatic", as her many male admirers call her. Lenina doesn't see why she shouldn't have sex with anyone she likes whenever the occasion offers, as to do so is merely polite behaviour and not to do so is selfish. The man she's trying to seduce by shedding her undergarment is John "the Savage", who's been raised far outside the "civilised" pale on a diet of Shakespeare's chastity/whore speeches, and Zuni cults, and self-flagellation, and who believes in religion and romance, and in suffering to be worthy of one's beloved, and who idolises Lenina until she doffs her zippicamiknicks in such a casual and shameless fashion.

Never were two sets of desiring genitalia so thoroughly at odds. And thereon hangs Huxley's tale.

Brave New World is either a perfect-world utopia or its nasty opposite, a dystopia, depending on your point of view: its inhabitants are beautiful, secure and free from diseases and worries, though in a way we like to think we would find unacceptable. "Utopia" is sometimes said to mean "no place", from the Greek ou-topos; others derive it from eu, as in "eugenics", in which case it would mean "healthy place" or "good place". Sir Thomas More, in his own 16th-century Utopia, may have been punning: utopia is the good place that doesn't exist.

As a literary construct, Brave New World thus has a long list of literary ancestors. Plato's Republic and the Bible's book of Revelations and the myth of Atlantis are the great-great-grandparents of the form; nearer in time are More's Utopia, and the land of the talking-horse, totally rational Houyhnhnms in Jonathan Swift's Gulliver's Travels, and HG Wells's The Time Machine, in which the brainless, pretty "upper classes" play in the sunshine during the day, and the ugly "lower classes" run the underground machinery and emerge at night to eat the social butterflies.

In the 19th century - when improvements in sewage systems, medicine, communication technologies and transportation were opening new doors - many earnest utopias were thrown up by the prevailing mood of optimism, with William Morris's News from Nowhere and Edward Bellamy's Looking Backward foremost among them.

Insofar as they are critical of society as it presently exists, but nevertheless take a dim view of the prospects of the human race, utopias may verge on satire, as do Swift's and More's and Wells's; but insofar as they endorse the view that humanity is perfectible, or can at least be vastly improved, they will resemble idealising romances, as do Bellamy's and Morris's. The first world war marked the end of the romantic-idealistic utopian dream in literature, just as several real-life utopian plans were about to be launched with disastrous effects. The Communist regime in Russia and the Nazi takeover of Germany both began as utopian visions.

But as had already been discovered in literary utopias, perfectibility breaks on the rock of dissent. What do you do with people who don't endorse your views or fit in with your plans? Nathaniel Hawthorne, a disillusioned graduate of the real-life Brooke Farm utopian scheme, pointed out that the Puritan founders of New England - who intended to build the New Jerusalem - began with a prison and a gibbet. Forced re-education, exile and execution are the usual choices on offer in utopias for any who oppose the powers that be. It's rats in the eyes for you - as in Nineteen Eighty-Four - if you won't love Big Brother. Brave New World has its own gentler punishments: for non-conformists, it's exile to Iceland, where Man's Final End can be discussed among like-minded intellects, without pestering "normal" people - in a sort of university, as it were.

Utopias and dystopias from Plato's Republic on have had to cover the same basic ground that real societies do. All must answer the same questions: where do people live, what do they eat, what do they wear, what do they do about sex and child-rearing? Who has the power, who does the work, how do citizens relate to nature, and how does the economy function? Romantic utopias such as Morris's News from Nowhere and WH Hudson's A Crystal Age present a pre-Raphaelite picture, with the inhabitants going in for flowing robes, natural settings in abodes that sound like English country houses with extra stained glass and lots of arts and crafts. Everything would be fine, we're told, if we could only do away with industrialism and get back in tune with nature, and deal with overpopulation. (Hudson solves this last problem by simply eliminating sex, except for one unhappy couple per country house who are doomed to procreate.)

But when Huxley was writing Brave New World at the beginning of the 1930s, he was, in his own words, an "amused, Pyrrhonic aesthete", a member of that group of bright young upstarts that swirled around the Bloomsbury Group and delighted in attacking anything Victorian or Edwardian. So Brave New World tosses out the flowing robes, the crafts, and the tree-hugging. Its architecture is futuristic - electrically lighted towers and softly glowing pink glass - and everything in its cityscape is relentlessly unnatural and just as relentlessly industrialised. Viscose and acetate and imitation leather are its fabrics of choice; apartment buildings, complete with artificial music and taps that flow with perfume, are its dwellings; transportation is by private helicopter. Babies are no longer born, they're grown in hatcheries, their bottles moving along assembly lines, in various types and batches according to the needs of "the hive", and fed on "external secretion" rather than "milk". The word "mother" - so thoroughly worshipped by the Victorians - has become a shocking obscenity; and indiscriminate sex, which was a shocking obscenity for the Victorians, is now de rigueur.

"He patted me on the behind this afternoon," said Lenina.

"There, you see!" Fanny was triumphant. "That shows what he stands for. The strictest conventionality."

Many of Brave New World's nervous jokes turn on these kinds of inversions - more startling to its first audience, perhaps, than to us, but still wry enough. Victorian thrift turns to the obligation to spend, Victorian till-death-do-us-part monogamy has been replaced with "everyone belongs to everyone else", Victorian religiosity has been channelled into the worship of an invented deity - "Our Ford", named after the American car-czar Henry Ford, god of the assembly line - via communal orgies. Even the "Our Ford" chant of "orgy-porgy" is an inversion of the familiar nursery rhyme, in which kissing the girls makes them cry. Now, it's if you refuse to kiss them - as "the Savage" does - that the tears will flow.

Sex is often centre stage in utopias and dystopias - who can do what, with which set of genital organs, and with whom, being one of humanity's main preoccupations. Because sex and procreation have been separated and women no longer give birth - the very idea is yuck-making to them - sex has become a recreation. Little naked children carry on "erotic play" in the shrubberies, so as to get a hand in early. Some women are sterile - "freemartins" - and perfectly nice girls, though a little whiskery. The others practise "Malthusian drill" - a form of birth control - and take "pregnancy surrogate" hormone treatments if they feel broody, and sport sweet little faux-leather fashionista cartridge belts crammed with contraceptives. If they slip up on their Malthusian drill, there's always the lovely pink-glass Abortion Centre. Huxley wrote before the pill, but its advent brought his imagined sexual free-for-all a few steps closer. (What about gays? Does "everyone belongs to everyone else" really mean everyone? We aren't told.)

Huxley himself still had one foot in the 19th century: he could not have dreamed his upside-down morality unless he himself also found it threatening. At the time he was writing Brave New World he was still in shock from a visit to the United States, where he was particularly frightened by mass consumerism, its group mentality and its vulgarities.

I use the word "dreamed" advisedly, because Brave New World - gulped down whole - achieves an effect not unlike a controlled hallucination. All is surface; there is no depth. As you might expect from an author with impaired eyesight, the visual sense predominates: colours are intense, light and darkness vividly described. Sound is next in importance, especially during group ceremonies and orgies, and the viewing of "feelies" - movies in which you feel the sensations of those onscreen, "The Gorillas' Wedding" and "Sperm Whale's Love-Life" being sample titles. Scents are third - perfume wafts everywhere, and is dabbed here and there; one of the most poignant encounters between John the Savage and the lovely Lenina is the one in which he buries his worshipping face in her divinely scented undergarments while she herself is innocently sleeping, zonked out on a strong dose of soma, partly because she can't stand the awful real-life smells of the "reservation" where the new world has not been implemented.

Many utopias and dystopias emphasise food (delicious or awful; or, in the case of Swift's Houyhnhnms, oats), but in Brave New World the menus are not presented. Lenina and her lay-of-the-month, Henry, eat "an excellent meal", but we aren't told what it is. (Beef would be my guess, in view of the huge barns full of cows that provide the external secretions.) Despite the dollops of sex-on-demand, the bodies in Brave New World are oddly disembodied, which serves to underscore one of Huxley's points: in a world in which everything is available, nothing has any meaning.

Meaning has in fact been eliminated, as far as possible. All books except works of technology have been banned - cf Ray Bradbury's 1953 novel Fahrenheit 451; museum-goers have been slaughtered, cf Henry Ford's "History is bunk". As for God, he is present "as an absence; as though he weren't there at all" - except, of course, for the deeply religious John the Savage, who has been raised on the Zuni "reservation", where archaic life carries on, replete with "meaning" of the most intense kinds. John is the only character in the book who has a real body, but he knows it through pain, not through pleasure. "Nothing costs enough here," he says of the perfumed new world, to where he's been brought as an "experiment".

The "comfort" offered by Mustapha Mond - one of the 10 "controllers" of this world, direct descendants of Plato's guardians - is not enough for John. He wants the old world back - dirt, diseases, free will, fear, anguish, blood, sweat, tears and all. He believes he has a soul, and like many an early 20th-century literary possessor of such a thing - think of the missionary in Somerset Maugham's 1921 story, Miss Thompson, who hangs himself after sinning with a prostitute - he is made to pay the price for this belief.

In a foreword to a new edition of Brave New World published in 1946, after the horrors of the second world war and Hitler's "final solution", Huxley criticises himself for having provided only two choices in his 1932 utopia/dystopia - an "insane life in Utopia" or "the life of a primitive in an Indian village, more human in some respects, but in others hardly less queer and abnormal". (He does, in fact, provide a third sort of life - that of the intellectual community of misfits in Iceland - but poor John the Savage isn't allowed to go there, and he wouldn't have liked it anyway, as there are no public flagellations available.) The Huxley of 1946 comes up with another sort of utopia, one in which "sanity" is possible. By this, he means a kind of "high utilitarianism" dedicated to a "conscious and rational" pursuit of man's "final end", which is a kind of union with the immanent "Tao or Logos, the transcendent Godhead or Brahmin". No wonder Huxley subsequently got heavily into the mescaline and wrote The Doors of Perception, thus inspiring a generation of 1960s dopeheads and pop musicians to seek God in altered brain chemistry. His interest in soma, it appears, didn't spring out of nowhere.

Meanwhile, those of us still pottering along on the earthly plane - and thus still able to read books - are left with Brave New World. How does it stand up, 75 years later? And how close have we come, in real life, to the society of vapid consumers, idle pleasure-seekers, inner-space trippers and programmed conformists that it presents?

The answer to the first question, for me, is that it stands up very well. It's still as vibrant, fresh, and somehow shocking as it was when I first read it.

The answer to the second question rests with you. Look in the mirror: do you see Lenina Crowne looking back at you, or do you see John the Savage? Chances are, you'll see something of both, because we've always wanted things both ways. We wish to be as the careless gods, lying around on Olympus, eternally beautiful, having sex and being entertained by the anguish of others. And at the same time we want to be those anguished others, because we believe, with John, that life has meaning beyond the play of the senses, and that immediate gratification will never be enough.

It was Huxley's genius to present us to ourselves in all our ambiguity. Alone among the animals, we suffer from the future perfect tense. Rover the Dog cannot imagine a future world of dogs in which all fleas will have been eliminated and doghood will finally have achieved its full glorious potential. But thanks to our uniquely structured languages, human beings can imagine such enhanced states for themselves, though they can also question their own grandiose constructions. It's these double-sided imaginative abilities that produce masterpieces of speculation such as Brave New World

To quote The Tempest, source of Huxley's title: "We are such stuff / As dreams are made on." He might well have added: "and nightmares".

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The intellectual, satirical, spiritual, hypnotic, and philosophical world of Aldous Huxley.

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