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A Covid-19 testing site in New York City on December 9. An estimated 27.6 percent of cases nationwide were caused by the XBB.1.5 variant this week, according to the CDC's most recent data.

What to Know About the 'Most Transmissible' Covid-19 Variant

XBB.1.5 is the fastest-spreading variant in the country, but it is not known to cause more severe illness than previous ones

Americans might choose more sustainable meals when beef items on menus are labeled "high climate impact."

Could Climate Impact Labels Change the Way We Eat?

Warnings on fast-food menus might make Americans think twice about choosing beef, a new study finds

Watermelon snow near the summit of the Chilkoot Trail in Alaska.

Why Some Western Snow Is Turning Pink

Algae bring a rosy hue to some mountain snowpacks, which might accelerate melting

People with a presciption for mifepristone will now be able to get that prescription filled at certified retail pharmacies.

Abortion Pill Can Be Sold at Pharmacies, FDA Says

The new rule could expand medication abortion access in some places

Some experts say cannabis product packaging may appear similar to other snacks, which can confuse kids. 

More Kids Are Accidentally Eating Marijuana Edibles, Study Finds

Between 2017 and 2021, accidental cannabis ingestion in young children rose by 1,375 percent

Researchers are studying psilocybin therapy to treat conditions like alcohol addiction and major depressive disorder.

Adults Can Now Use Magic Mushrooms With Supervision in Oregon

State-certified facilitators will guide patients in hallucinogenic trips, which may help treat mental health conditions

Frost-capped sand dunes near Mars's north pole, captured by the Mars Reconnaissance Orbiter two days after the planet's winter solstice

See the Chilling Beauty of Winter on Mars

NASA images reveal frost, geysers and intricate frozen patterns on the Red Planet

A photo of Henrietta Lacks in the living room of her grandson, Ron Lacks

Henrietta Lacks' Virginia Hometown Will Build Statue in Her Honor, Replacing Robert E. Lee Monument

Lacks' unique cancer cells were taken without consent and used for medical breakthroughs

The bats were kept inside when temperatures dropped below freezing but were released back to their homes in late December.

Texas Woman Rescues 1,500 Hypothermic Bats During Cold Snap

The Houston Humane Society wildlife center director nursed the animals to health in her attic

The new local celebrity of Cypress, California, perches on a rooftop.

A Rare Snowy Owl Is Captivating Southern California

How the Arctic bird ended up among palm trees remains a mystery

China has eased its Covid testing with the relaxation of zero-Covid policies.

Covid Surges in China, Reaching an Estimated 37 Million Cases Per Day

The country abruptly relaxed its zero-Covid policy earlier this month

Glass frog photographed during sleep and while active, showing the differences in red blood cells within the circulatory system. 

These Frogs Turn Nearly Invisible While Sleeping

The transparent glass frog can hide 89 percent of its blood in its liver, new research shows

One of the first-ever photos of a young pink iguana

First Recorded Pink Iguana Hatchlings Found on Galápagos Island

After a ten-month effort, researchers discovered the young endangered reptiles on a remote volcano

Aedes aegypti can carry Zika, dengue, chikungunya and other viruses.

‘Super-Resistant’ Mosquitoes Can Survive Insecticides in Southeast Asia

Researchers found high numbers of a genetic mutation linked to this resilience in Cambodia and Vietnam

The small mammal's foot in the fossil of the microraptor.

This 120-Million-Year-Old Dinosaur Fossil Had a Mammal Hiding in Its Stomach

The finding represents only the second recorded instance of a dinosaur consuming a mammal

Pollinators, including bees, are suffering because of human activities.

Shrinking Pollinator Populations Could Be Killing 427,000 People Per Year

New research explores the relationship between human health and crop loss due to pollination deficits around the world

Kepler-1658b was the first exoplanet discovered by NASA’s Kepler Space Telescope in 2009.

This Exoplanet Is Doomed to Be Obliterated by a Star

Kepler-1658b is slowly spiraling toward a fiery demise

The elusive yeast strain had been lurking in the soil at the University College Dublin in Ireland.

Elusive Yeast That Gave Rise to Lagers Found in Europe for the First Time

Students in Ireland discovered the ancestral fungus in the soil on their university's campus

An artistic rendering of InSight on Mars

What NASA's Retired InSight Lander Taught Us About Mars

The Red Planet robot was officially decommissioned after dust on its solar panels robbed it of power

A replica of a Denisovan finger bone fragment. Now extinct, Denisovans were an ancient species of human that mated with ancestors of modern humans.

Denisovan DNA May Have Shaped Immune Systems in Papua New Guinea

The inherited genetic mutations might provide an advantage in fighting diseases

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