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An MRI of a brain of a person with Alzheimer's disease. A new study suggests having two copies of a genetic variant called APOE4 is a cause of the disease, not just a risk factor for it.

Almost All People With Two Copies of This Genetic Variant Develop Signs of Alzheimer's Disease, Study Finds

The research focused on a variant called APOE4 and largely looked at people of European ancestry—risk levels are different for other groups, the authors say

Ellen Ochoa was awarded the Presidential Medal of Freedom at the White House last week, becoming the tenth astronaut to receive the country's highest civilian honor.

Ellen Ochoa, Former NASA Astronaut and First Hispanic Woman in Space, Receives Presidential Medal of Freedom

The former Johnson Space Center director logged four space shuttle flights and 1,000 hours in orbit over her 30-year career

Previous research had found leprosy in modern red squirrels, and genetic analysis suggested the strain was closely related to leprosy found in medieval humans.

Medieval Squirrels and Humans May Have Spread Leprosy Back and Forth

Archaeologists uncovered evidence of leprosy in a medieval red squirrel in England, and DNA evidence revealed the strain was similar to what was circulating in humans at the time

Close-up showing the Archaeopteryx fossil’s skull, neck, spine, rib cage and wing bones. The fossil will go on view at Chicago's Field Museum on May 7.

Chicago Museum Unveils the 'Most Important Fossil Ever Discovered': the Feathered Dinosaur Archaeopteryx

Archaeopteryx provided the missing link between dinosaurs and the avians of today, serving as critical evidence for Charles Darwin’s theory of evolution

Bumblebees, on the whole, are better adapted for cooler temperatures than for heat—one species, Bombus polaris, even lives in the Arctic.

Bumblebee Nests May Be Overheating With Rising Global Temperatures, Study Finds

Across various species and regions, bumblebee nests thrive between 82 and 89.6 degrees Fahrenheit—and climate change could make it harder to find habitats in that range

Shanidar Z likely stood 5 feet tall and was around 40 years old when she died.

Meet Shanidar Z, a Neanderthal Woman Who Walked the Earth 75,000 Years Ago

After carefully piecing her skull back together, archaeologists and paleoartists have created a lifelike 3D reconstruction of the woman's face

An angled view of the solar system with main asteroid belt discoveries in green and near-Earth objects in light blue.

Scientists Discover 27,500 Asteroids in Old Telescope Images Using A.I.

While most of the team’s new finds are located in the main asteroid belt, about 100 are near-Earth asteroids that pass close to our planet's orbit

More than 1,000 sea lions gathered at San Francisco's Pier 39 last week, marking the largest congregation of the marine mammals at the city's Fisherman's Wharf in about 15 years.

More Than 1,000 Sea Lions Gather at San Francisco's Pier 39, the Largest Group in 15 Years

The pinnipeds came to the area to feed on anchovies and herring as they prepare for breeding season

Scientists experimented with planting tomatoes, peas and carrots together and separately in several types of soil.

An Ancient Maya Practice Could Be the Key to Growing Vegetables on Mars

Researchers are exploring whether intercropping—a technique of growing different types of plants in close proximity to one another—could be the secret to agriculture on the Red Planet

The U.S. Navy works to recover the Orion spacecraft following its 2022 test flight to the moon.

NASA's Orion Capsule Heat Shield Wore Away in More Than 100 Places During 2022 Test Flight, Posing 'Significant Risks'

A new report highlights safety issues that NASA must address before using the spacecraft to send astronauts to the moon, and the agency is already working on fixing the problems

The tornadoes uprooted and snapped some trees, but fortunately, no injuries or deaths have been reported.

Rare Tornado Spinning the 'Wrong' Direction Forms Over Oklahoma

A powerful anticyclonic tornado uprooted trees and damaged some buildings on the night of April 30, and a second unusual twister changed direction, doubling back on its path

In more than 20 years of field research, Rakus is the first orangutan to be observed using a medicinal plant to treat wounds.

In a First, an Orangutan Healed His Own Wound Using a Known Medicinal Plant

The primate named Rakus chewed up yellow root and applied it to an open facial wound, closing the sore within days

The bomb was discovered near Mewa Arena, home of the Mainz 05 soccer club.

World War II-Era Bomb Successfully Defused Near German Soccer Stadium

The 1,110-pound ordnance is one of many bombs that have surfaced in Europe decades after the war's end

The driverless race cars were controlled with cameras, advanced processing units and sensors.

World's First Race of A.I.-Driven Cars Was Filled With Spins, Swerves and Stops

Though the cars could not compare to human drivers, the event may help improve self-driving technology, experts say

To create mouse-rat "chimeras," researchers injected rat stem cells into mouse embryos that lacked some genes for brain development.

Researchers Breed Mice With Hybrid Brains Containing Cells From Rats

In one experiment, rat neurons helped mice restore their senses of smell—the first time any animal has perceived the world through the sensory hardware of another species

A coal-fired power plant in Germany, which derives about 27 percent of its national electricity from coal.

Seven Major Nations Agree to Phase Out Coal by 2035, Though Vague Language Leaves Wiggle Room

The wealthy, industrialized countries set a flexible schedule to cut one of the dirtiest fossil fuels from their economies

Previous research suggested that anger can increase people's risk of heart attacks. In the new study, researchers found that part of the reason why could be that anger briefly reduces blood vessels' ability to widen.

Can Anger Affect Your Heart Health? Scientists Find the Strong Emotion Impacts How Blood Vessels Function

The results could even help explain why stress from anger may trigger a heart attack

While penguins have feathers that shield their skin from radiation, their eyes remain unprotected. Increased ultraviolet radiation exposure could also have harmful effects for Antarctic organisms like seals, krill and plankton, per a new paper.

Antarctica's Ozone Hole Is Persisting Later Into the Year, Raising Concerns for Wildlife

As a result of the longer-lasting hole, harmful ultraviolet radiation is reaching Earth during a time when young penguins and seals are more vulnerable, scientists say

Astronauts could run around the interior walls of cylindrical homes on the moon.

Could Running Around a 'Wall of Death' Help Astronauts Stay in Shape on the Moon?

Short sprints on these cylindrical structures, long used by daredevil motorcycle riders, might promote muscle mass and bone density in low-gravity conditions

One of the loose zebras runs through a pasture before being recaptured. The zebra that is still on the loose was spotted on Monday.

Four Zebras Escape From Trailer on Washington State Highway—One Is Still on the Loose

The animals ran around residential areas before community members—including a former rodeo bullfighter—helped corral three of them

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