Science
These Corals Are Made for Walking
Corals come in a wide array of shapes, sizes and colors, and they build sprawling reefs that serve as refuges for vast amounts of biodiversity in the ocean. But they are not known for being fleet of foot.
This is because out of the more than 6,000 species of coral known to science, most are colonial organisms — individual animals that make their homes next to and on top of one another. And as adults, these corals are immobile.
But there’s another, lesser-known and understudied kind of coral that’s completely solitary. And some of these animals, known as mushroom corals, can walk.
“They’re very little,” said Brett Lewis, a marine ecologist and microscopist at Queensland University of Technology in Australia. “And they are adorable.”
Using time-lapse cameras and an aquarium that blocked out all other light, Mr. Lewis recently put inch-long mushroom corals through an experiment.
One side of the aquarium had a sliver of white light, like you would find in shallow coastal habitats. The other had a small beam of blue light, like you would find in slightly deeper areas of the ocean. In each of three trials, the mushroom corals showed a strong preference for the blue light, inching their way toward it, Mr. Lewis reported Wednesday in the journal PLoS One.
As for how a mushroom coral actually moves, Mr. Lewis’s research revealed that the mechanics are surprisingly similar to the way one of coral’s closest cousins, the jellyfish, gets around.
“Jellyfish can move through water by twisting and contracting muscles in and around the edges of that bell shape as it pulses,” he said.
With bodies shaped similarly to the bell of a jellyfish, Mr. Lewis said, the mushroom corals spend a long time inflating the tissues on the outermost edge of their bodies before releasing them quickly. “And that allows the coral to kind of pop themselves forward, hopping across the substrate,” he said.
To be clear, while a mushroom coral can move, it takes its sweet time about it. The corals appear rather spry in the time-lapse footage. But in real time, it can take several hours for a mushroom coral to move just a few fractions of an inch. In the study, a series of “periodic pulses” moved a mushroom coral 220 millimeters over the course of one to two hours.
“I watched this thing for a very long time, thinking it was going to pop,” Mr. Lewis laughed. “I was like, ‘Christ almighty, this is taking a long time to happen.’”
While the idea of roving corals was first proposed in 1992 and then documented for the first time in 1995, the scientists who initially described the behavior didn’t have the best resolution videography at their disposal. This meant that scientists couldn’t fully investigate the biomechanics necessary for a coral to skedaddle. But now, Mr. Lewis and his team have shined a light on this little-known corner of marine biology.
The study “provides much more detail in the mechanism and behavior of motion,” said Bert Hoeksema, a coral taxonomist at the University of Groningen in the Netherlands who was not involved in the new research.
There are many reasons a mushroom coral might want to relocate. The animals frequently begin their lives living among colonial corals. But these habitats tend to be crowded and bombarded by waves. Later in life, it behooves the mushroom corals to migrate to deeper but calmer waters, where they can establish themselves on a sandy bottom with others of their kind. This also assists the animals in reproduction.
Migration “may help them to escape unfavorable situations, such as being buried underneath a layer of sand, being toppled over or being too close to aggressive competitors for space, such as toxic sponges,” Dr. Hoeksema said.
A mushroom coral’s incremental movement may seem inconsequential when considered against the distances traveled by other migrating creatures, such as wildebeest, monarch butterflies or Arctic terns. But such creeping has served the species well for hundreds of millions of years.
“At their scale, they’re so little that this is such a large movement for them,” Mr. Lewis said. “They’re moving their body length in such a short time, with such a simple system. That’s a sprint for them.”
Science
China Launches Reusable Rocket in Race With SpaceX
Video released by Chinese state media shows a state-owned aerospace company launching a rocket and recovering part of it on Friday. The successful launch of a reusable rocket was a major step for China toward challenging SpaceX’s satellite internet dominance.
Science
Nobel Prize winner leaving UC Berkeley for new role in China
Nobel Prize recipient Omar Yaghi is leaving his role at UC Berkeley to lead the development of a new artificial intelligence institute at Tsinghua University in Beijing, the Chinese university announced.
Yaghi will head the AI Chemistry and Materials Research Institute at Tsinghua, where he was appointed an honorary professor in 2022. Known as AIMATRY (AI × Materials × Chemistry), the new center will focus on material design and synthesis through artificial intelligence, according to a statement from the university.
In 2025, Yaghi shared the Nobel Prize in chemistry with Susumu Kitagawa of Kyoto University and Richard Robson of the University of Melbourne for their development of metal-organic frameworks, a type of super-porous material in which metal ions and carbon-based molecules combine to form crystals with exceptionally large surface areas.
The material has the potential to combat climate change by capturing and storing carbon or other pollutants, and by extracting water from the atmosphere in water-scarce areas. Upon awarding the prize, a member of the Nobel committee likened the technology’s ability to store enormous amounts of stuff in seemingly compact spaces to Hermione Granger’s enchanted handbag in the Harry Potter series.
Yaghi’s Irvine-based company, Atoco, has said it will start taking orders later this year for its technology that harvests water from the air.
A representative for Yaghi said he was not yet available to respond to questions.
China is one of several countries that has been actively recruiting scientists from the U.S., where the Trump administration has slashed science funding, suspended research grants, fired science advisors and tightened immigration restrictions.
“For many, many years, our funding was very competitive; if you worked hard and you were doing good research, you would get funding,” Yaghi said of the U.S. in an interview with Scientific American earlier this year. “The current state is not so encouraging because of the cutting back on grants and support of science by the very agencies that many university researchers rely on.”
Yaghi was born in Jordan to Palestinian refugees, and immigrated to the U.S. when he was 15 to study.
“We’ve learned over and over in human civilization that scholars can move across borders,” Yaghi told the New York Times last year. “This is how knowledge spread and how vast regions of the world lifted themselves out of poverty.”
Science
Trump administration seeks to limit federal funding that doesn’t ‘advance’ presidential policies
A new rule proposed by the White House Office of Management and Budget would fundamentally overhaul the way federal grants are awarded and overseen — a sweeping change that one scientific society said “would all but end the use of scientific merit in the selection of grants and programs across the government.”
Proposed in late May, the rule would give political appointees unprecedented control over federal grants for research, education and infrastructure, and specifies that government funds can only be spent on projects “aligned with administration policies and priorities,” according to a copy of the proposed rule.
The rule would also restrict research topics, limit U.S. scientists’ ability to collaborate with colleagues in other countries and make it easier for the government to suspend or cancel grants at any time.
The changes are intended to improve “transparency, accountability, and oversight for Federal awards” while “ensuring that American tax dollars are not wasted or misused,” according to the White House office.
But critics say that if the rule is implemented, the final sign-off for grants will no longer be in the hands of subject-matter experts within individual agencies, but in those of political appointees.
“This touches all parts of American life,” said Dr. Eric Rafla-Yuan, a psychiatrist who practices at the Veterans Administration and San Diego County’s psychiatric hospital.
“Control of how all of the federal grants and programs are funded will fall under a small group of highly partisan individuals who would have very few limits on how they spend these billions of taxpayer dollars,” said Rafla-Yuan, who also chairs the Committee to Protect Public Mental Health advocacy group. “This touches everyone’s life, even if they don’t realize it.”
OMB published the proposed rule May 29, opening a 45-day comment period that closes July 13.
Opposition to the proposed rule has mobilized multiple sectors of society. Professional groups representing cancer researchers, civil engineers, county governments, medical schools, housing agencies, city and municipal governments, nonprofits and others have publicly expressed concerns about potential consequences.
By midday Thursday, the Federal Register logged nearly 100,000 comments about the proposal, many of them expressing concern.
“I understand the need for oversight, fiscal responsibility, and accountability. That is not the issue,” wrote Jack Feldman, a neuroscientist who holds the David Geffen School of Medicine Chair in Neuroscience at UCLA. “The issue is whether scientific research is to be judged by scientific merit, or whether it can be approved, denied, or terminated according to broad political criteria that may change from one administration to the next.”
Crucially, the rule converts policies governing federal grants from “guidance” into binding regulations that all agencies would be required to follow. It would give political appointees power to override federal agencies’ merit-based reviews and mandate that a political appointee review decisions to ensure that all awards “demonstrably advance the President’s policy priorities.”
The elevation of political appointees in what were previously merit-based decisions has alarmed many scientists.
“The proposed rule changes would all but end the use of scientific merit in the selection of grants and programs across the government,” read a statement from the Planetary Society, a nonprofit dedicated to space research.
Researchers and science groups have also expressed concern about a section of the rule prohibiting the promotion of “theories of disparate-impact liability” — a legal concept that refers to policies that appear neutral but cause disproportionate harm to certain groups.
The section’s vague language and many loopholes could have a chilling effect on any research that studies the effects of a disease, policy or public health intervention on any specific group of people, Rafla-Yuan said.
As an example, he said, “if there’s a specific age range that is at higher risk for suicide, and we want to figure out, well, what’s going on with people that are aged 14 to 19 … we can’t do that under the wording in this rule.”
New restrictions on collaborations with scientists in other countries would hinder opportunities for U.S. researchers and limit innovation, said Joanne Padrón Carney, chief government relations officer for the American Assn. for the Advancement of Science.
“Science is a global enterprise. Especially in biomedical and public health fields, diseases don’t care about borders or government policies,” she said.
California’s congressional delegation sent a letter Wednesday asking OMB to rescind the proposal, outlining concerns about its impact on scientific innovation, U.S. competitiveness and the fiscal stability of local governments, many of which rely on federal grants for local services.
The proposed rule grants the federal government broad powers to suspend or cancel grants for any reason, introducing “unprecedented unpredictability into local governance,” the lawmakers wrote, “leaving vital infrastructure projects unfinished and abandoning vulnerable populations who rely on these services.”
Republican Sen. Susan Collins has also asked the White House to withdraw certain parts of the letter and extend the public comment period, saying the proposed rule as written would “harm small and rural communities, undermine scientific and biomedical research, and conflict with Congress’ control over the federal funding process.”
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