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Thursday, July 09, 2026

Aerial-aquatic “flapping-wing” robot sheds light on how birds move between air and water



Summary author: Walter Beckwith



American Association for the Advancement of Science (AAAS)





A flapping-wing robot that can both swim underwater and fly through the air is helping scientists rethink how diving birds manage life in two radically different worlds. “In addition to shedding light on the morphological and behavioral adaptations of aerial-aquatic animals, the design principles described here lay the foundation for a class of robots that can be used for limnology, oceanography, marine ecosystem monitoring, and coastal management,” the authors write. Roughly 100 bird species are capable of both flying through the air and propelling themselves underwater using only their wings. While these birds use a similar flapping motion in both environments, they adjust by slowing their wingbeats and reducing their wing area underwater. Because water is nearly 1,000 times denser than air, moving efficiently in each medium requires very different forces and wing movements. However, studying these behaviors and movements in live animals is challenging, and computer simulations struggle to model the complex interactions between flapping wings, fluid forces, and the transition from water to air accurately. As a result, the physiological adaptations and compromises that allow birds to move through such disparate environments efficiently remain relatively unknown. According to Raphael Zufferey and colleagues, robotic models offer a valuable alternative because they adhere the same physical principles as living animals while enabling researchers to control their design and movement precisely.

 

In this study, Zufferey et al. present flapping-wing robots capable of flying through the air, swimming underwater, and transitioning seamlessly between the two environments – aerial-aquatic vehicles designed to explore the physical challenges faced by diving birds and the design strategies that make dual-environment locomotion possible. The modular, 250-gram robot features a streamlined fuselage, two flexible membrane wings, and a movable tail. It is also fully waterproof, untethered, and equipped with onboard electronics, allowing the authors to adjust wing-flapping frequency and tail position wirelessly, to examine systematically how wing size, flexibility, and flapping influence movement in air, underwater, and during transitions between the two environments. By comparing data from diving birds with their experimental observations, Zufferey et al. found that complex wing-folding mechanisms are not essential for aerial-aquatic locomotion. Instead, an effective balance of wing flexibility, size, and flapping frequency is sufficient to achieve similar performance. What’s more, experiments revealed that smaller wings increase underwater speed but do not improve swimming efficiency, suggesting that reduced wing size in diving birds may primarily enhance maneuverability and prey pursuit rather than conserve energy. Wings with intermediate flexibility provided the best overall performance, improving underwater propulsion while still generating sufficient lift for flight. Because flying requires less energy than swimming, the authors discovered that it was more efficient for the robot to leave the water and fly than to remain submerged over longer distances. The study also showed that wing-powered takeoff from the water is possible without leg assistance, although it requires substantial power.

 

Plants get wearables to track their health



With new sensors, farmers could use real-time information to manage crop conditions before visible signs of plant stress appear




Tufts University

A tattoo-like sensor on the surface of a leaf 

image: 

“The leaf sensor is more of an early warning system showing how the plant is responding in the moment, before visible signs appear,” said Nafize Hossain. 

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Credit: Nafize Hossain





A smartwatch can tell us the level of oxygen in our blood, when our sleep is restless, or the number of steps we take in a day. Now imagine that kind of tracking ability for plants.

By the time farmers see curling leaves or stunted growth in their fields, their crops may already have spent days under stress. A new innovation in plant “wearable” sensors aims to catch those distress signals earlier—before the plant visibly suffers, allowing farmers to respond and help their crops thrive.

In a recent study from Tufts University, researchers created tiny tattoo-like sensors that adhere to leaf surfaces and a stretchable band that wraps around stems. Together, they track two vital signs of plant life—the temperature and humidity beneath the leaf’s surface, and whether the stem is still growing. Even more striking, the system runs without an external battery, scavenging power from moisture evaporating from the plant itself.

“The larger promise is not merely that one plant can wear one sensor,” said Sameer Sonkusale, professor of electrical and computer engineering at Tufts and senior researcher in the project. “It is that fields could one day contain networks of plant-level monitors, each reporting early signs of thirst, salt stress, disease or nutrient imbalance. Satellites and drones already give farmers a bird’s-eye view. Plant wearables could provide something more intimate: the plant’s-eye view.”

Current methods in monitoring crops use satellite imagery and drones to get visible, infrared, and microwave data that map out greenness, uneven growth, temperature, pest damage, soil moisture, and other big picture measurements of crop stress. Soil sensors can measure moisture, temperature, pH, and some nutrient levels. And weather stations provide information on air temperature, humidity, rainfall, wind, and sun exposure.

While those measurements are useful, they focus on conditions that may affect the crops in the future or an assessment of damage already done. “The leaf sensor is more of an early warning system showing how the plant is responding in the moment, before visible signs appear,” said Nafize Hossain, a graduate student at Tufts who led the research in the Sonkusale lab.

The sensors can also be extended to track other important indicators of plant health, such as levels of important nutrients and plant hormones that are early signals of root, leaf, stem, and fruit growth, as well as response to pathogens.

Stress Trackers

Resembling a temporary tattoo, the leaf sensor is thin, flexible, and can sit on uneven surfaces, allowing the plant to breathe and bend in the wind without damaging it. “Other plant sensors exist, but their ability to track multiple stressors and growth-related parameters is limited,” said Hossain, “and the technology often relies on external batteries, which complicate field deployment.”

The sensor first developed by the researchers provides information on the “vapor pressure deficit,” or VPD. It’s a technical term, but it describes something very intuitive—how likely the air is to pull water from the plant. When VPD is high, the air is dry and pulls moisture from leaves more aggressively. Plants respond by closing their stomata, the tiny pores that regulate gas exchange and water loss. That can protect them from dehydration, but it also slows photosynthesis and growth.

The Tufts leaf moisture sensor uses vanadium pentoxide crystals separated into extremely thin “nanosheets.” The nanosheets are stacked into layers and arranged in a membrane. Another layer of graphene (made of carbon atoms) forms a sieve to let moisture through from the plant to the nanosheets. When that happens, the water forms ions, which sweep through sheets creating a current—and voila, it’s not only a sensor, but also a battery. The level of the current is directly proportional to the amount of moisture exchange with the air.

The power is tiny—microwatts—but enough, with low-power electronics and energy storage to support periodic sensing.

The stem-based device borrows from kirigami, the Japanese art of cutting paper so it can stretch and deform in controlled ways. The sensor is coated with a eutectogel, a soft, ion-conducting gel that changes electrical resistance as the stem expands or contracts. In healthy growth, the stem diameter tends to increase. Under stress, growth may slow or the stem may even shrink.

Pairing the two types of sensors is important, because plants can show stress on more than one time scale. Leaf sensors, for example, can show if the plant is facing immediate conditions that drive water loss, while stem growth captures a slower biological process.

In tests on bell pepper plants, the system distinguished healthy plants from plants facing water deficit and salinity stress. Healthy plants showed rhythmic VPD changes over time, following normal daily cycles of air moisture.

Water-stressed plants showed a rising VPD trend. Salinity-stressed plants showed a different pattern, with reduced VPD compared with controls, likely linked to altered water uptake and stomatal behavior. Meanwhile, the stem sensor tracked growth in healthy plants and shrinking or reduced diameter in stressed plants.

The sensors are built with field conditions in mind. The leaf sensor is designed to tolerate bending and stretching, while ethe stem sensor’s kirigami pattern helps distribute strain and reduces the effects of abrupt disturbances like strong winds.

The team is currently working on a fully functional wireless communication platform for the sensors using LoRa (long range) or Bluetooth-based communication standards.

Trump’s Anti-Clean Energy Policies Set to Cost US Consumers $650 Billion by 2040

“The fossil fuel industry and this administration’s policies are adding fuel to the fire, and ordinary ratepayers are the ones getting burned,” said one campaigner.



US President Donald Trump and Environmental Protection Agency Administrator Lee Zeldin arrive for an event to announce a rollback of the 2009 endangerment finding in the Roosevelt Room at the White House in Washington, DC on February 12, 2026.
(Photo by Anna Moneymaker/Getty Images)

Brett Wilkins
Jul 08, 2026
COMMON DREAMS

The Trump administration’s rollback of clean energy policies will cost American consumers $650 billion in additional energy bills by 2040, according to an analysis published Wednesday by a nonpartisan think tank.

Energy Innovation, a San Francisco-based energy and climate policy think tank, said in its report that “federal policy changes since January 2025 will increase energy prices, slow economic growth and job creation, increase air pollution and healthcare costs, and worsen grid reliability.”

The analysis examines seven major policy shifts during the second term of President Donald Trump, who—for the third time—ran on an aggressively pro-fossil fuel and anti-clean energy platform:Passage of the so-called One Big Beautiful Bill Act (OBBBA);
The Environmental Protection Agency’s (EPA) reconsideration and repeal of Clean Air Act Greenhouse Gas Standards, Mercury and Air Toxics Standards, and Clean Water Act Effluent Limitations Guidelines for electric power plants;
EPA’s repeal of the endangerment finding and federal tailpipe emissions standards;
Passage of Congressional Review Act resolutions overturning approvals for state-level tailpipe emissions standards;
Actions to limit renewable energy development—especially onshore and offshore wind plants—including limitations on issuance of new permits;
Department of Energy cancellations of hydrogen hub funding and easing of 45V tax credit qualification for natural gas-based hydrogen; and
EPA’s cancellation of the $7 billion Solar for All grant program.

According to the analysis, “Households will pay an additional $650 billion for energy—an average of $460 per household in 2035 and $490 in 2040.”

Additionally, the report states that “cutting policies that drive innovation and efficiency in the transportation sector will inflate gasoline prices 14% in 2035 and 26% in 2040, atop near-term upward pressure from the Iran War and other market forces.”

“OBBBA and reduced federal support for domestic manufacturing and innovation will cost the US economy 820,000 jobs per year on average over the next decade, in addition to the 144,000 clean energy jobs lost within the past 18 months,” the publication forecasts.

“Slowing down electrification and domestic energy manufacturing will lower [gross domestic product] in all years, totaling $2.3 trillion cumulative lost GDP, with effects flowing into other economic sectors,” the study warns. “The US economy will lose $150 billion in GDP in 2030, peaking at a $250 billion net loss in 2032, then reverting to losses of $200 billion in 2035 and $120 billion in 2040.”

Furthermore, “worsening local air pollution will raise healthcare costs by $43 billion, with annual increases of $4 billion in 2035 and $4.5 billion in 2040, contributing to rising household costs alongside rising energy prices and goods inflation.”

Energy Innovation stressed that states must act to mitigate the costs and harms of federal inaction. The report recommends helping wind and solar projects qualify for expiring tax credits under safe harbor rules, removing barriers to additional clean energy development, boosting electric vehicles, supporting energy efficient electrification, and stimulating investment in new clean industries.

The new analysis—whose findings are disputed by the Trump administration—comes amid an unabated affordability crisis that Trump vowed to tackle, and as electricity prices soar in much of the nation as a heat dome, fueled by human burning of fossil fuels, broils large swaths of the country in what many experts warn is the new normal in a worsening climate emergency.

Responding to the analysis, Candice Fortin, US campaigns manager at the climate action group 350.org, said: “This report puts numbers on something households are already feeling in their bills and their blackouts. We were told cutting clean energy would lower costs. Instead, we’re seeing the opposite: rates spiking, grids failing under record heat, and households paying more while data centers’ electricity use explodes.”

“You can’t fix an affordability crisis by blocking the cheapest, fastest power we have to build,” Fortin added. “The fossil fuel industry and this administration’s policies are adding fuel to the fire, and ordinary ratepayers are the ones getting burned.”