Sciencenews.org
A century ago, Alexander Friedmann envisioned the universe’s expansion
Alexander Friedmann saw that Einstein’s equations predicted multiple cosmic scenarios, including a Big Bang.



Caribou gut parasites indirectly create a greener tundra
Caribou merely sickened by parasites eat less vegetation, allowing plants to flourish.



Why some scientists want serious research into UFOs
Science grapples with unknown phenomena all the time. Investigating UAP and whether they're related to aliens shouldn't be different, researchers say.



These dolphins may turn to corals for skin care
For Indo-Pacific bottlenosed dolphins, rubbing against corals and sea sponges that contain antibacterial compounds could help keep skin healthy.



Unexplained hepatitis cases in kids offer more questions than answers
There is a lot that is unclear about the hepatitis that’s impacting several hundred children worldwide, but parents shouldn’t panic.



Here’s why pipe organs seem to violate a rule of sound
Why reedless wind instruments’ fundamental tones are lower than expected is an 160-year-old mystery. Physicists have now solved it.



A galactic smashup might explain galaxies without dark matter
Scientists are debating whether a trail of galaxies reveals the origins of two weird dark matter–free galaxies.



COVID-19 has killed a million Americans. Our minds can’t comprehend that number
We intuitively compare large, approximate quantities but cannot grasp such a big, abstract number as a million U.S. COVID-19 deaths.



A Denisovan girl’s fossil tooth may have been unearthed in Laos
A molar adds to suspicions that mysterious hominids called Denisovans inhabited Southeast Asia's tropical forests.



Pressure to conform to social norms may explain risky COVID-19 decisions
As a science reporter covering COVID-19, I knew I should mask up at Disney World. Instead, I conformed, bared my face and got COVID-19.



High-energy neutrinos may come from black holes ripping apart stars
Where extremely energetic neutrinos originate from is a mystery. A new study supports the idea that “tidal disruption events” are one source.



A ‘mystery monkey’ in Borneo may be a rare hybrid. That has scientists worried
Severe habitat fragmentation caused by expanding palm oil plantations may have driven two primate species to mate that wouldn’t have otherwise.



Farmers in India cut their carbon footprint with trees and solar power
Planting trees near crops and pumping water with solar power in India is reducing greenhouse gas emissions from agriculture.



A special brew may have calmed Inca children headed for sacrifice
The mummified remains contained a substance that may reduce anxiety and is found in ayahuasca, a psychedelic ceremonial liquid still drunk today.



NASA’s InSight lander has recorded the largest Marsquake yet
The magnitude 5 temblor, detected May 4, will help scientists learn more about the Red Planet’s interior.



Experiments hint at why bird nests are so sturdy
A bird’s nest is a special version of a granular material. Lab experiments and computer simulations explain its quirky behavior.



Prehistoric people may have used light from fires to create dynamic art
When brought near flickering flames, prehistoric stone engravings of animals seem to move, experiments with replicas and virtual reality show.



We finally have an image of the black hole at the heart of the Milky Way
Observations from the Event Horizon Telescope reveal the turbulent region around our home galaxy’s black hole, Sagittarius A*, in new detail.



Machine learning and gravity signals could rapidly detect big earthquakes
Large earthquakes make speed-of-light adjustments to Earth’s gravitational field. Researchers have now trained computers to detect the signals.



Here’s the latest good and bad news about COVID-19 drugs
After coronavirus vaccines, antivirals and a monoclonal antibody are the next line of defense, but the treatments may be hard for some people to find.



Eating meat is the Western norm. But norms can change
A meat-heavy diet, with its high climate costs, is the norm in the West. So social scientists are working to upend normal.



Baby marmosets may practice their first distinctive cries in the womb
Ultrasounds tracking fetal mouth movements in baby marmosets pinpoint the early development of the motor skills needed for vocalization.



Why it’s so hard for a one-hit wonder to have a lasting music career
An analysis of nearly 3 million pop songs from 1959 to 2010 shows fame is a dance between similarity and innovation.



The sun’s searing radiation led to the shuffling of the solar system’s planets
As the young sun’s radiation evaporated gas from its surrounding disk, it triggered a jumbling of the giant planets’ orbits, simulations suggest.



These bats buzz like wasps and bees. The sound may deter hungry owls
Researchers have identified what may be the first known case of a mammal mimicking an insect.



How to wash chicken in the kitchen more safely, according to physics
Despite the advice of health experts, most people who cook chicken at home wash it. New research offers ways to reduce spreading dangerous germs.



These six foods may become more popular as the planet warms
Millet, kelp, Bambara groundnut and cassava are resilient, sustainable and nutrient dense — good options for future dinner plates.



50 years ago, scientists had hints of a planet beyond Pluto
In 1972, calculations from Halley’s comet offered evidence of another planet. Today’s astronomers are still searching for a Planet Nine.



Oat and soy milks are planet friendly, but not as nutritious as cow milk
Plant-based milks are better for the environment, but nutrition-wise they fall behind cow milk.



Latin America defies cultural theories based on East-West comparisons
Theories for how people think in individualist versus collectivist nations stem from East-West comparisons. Latin America challenges those theories.



Replacing some meat with microbial protein could help fight climate change
Just a 20 percent substitution could cut deforestation rates and land-use CO2 emissions by more than half by 2050, a new study suggests.



How some sunscreens damage coral reefs
In lab experiments, sea anemones and coral turned oxybenzone into a toxin activated by light. But helpful algae may provide a layer of protection.



A very specific kind of brain cell dies off in people with Parkinson’s
Of out 10 kinds of dopamine-making nerve cells, only one type is extra vulnerable in Parkinson’s disease.



How much does eating meat affect nations’ greenhouse gas emissions?
How much meat eating affects worldwide greenhouse gas emissions comes clear in new country-by-country analyses.


