Chemical clues and computer simulations suggest the two rocky planets have unique origin stories.

Could the geometry of our brains increase the risk of Alzheimer?s disease? It?s a provocative question, but one that some scientists are beginning to explore.

It?s a fall favorite among stargazers, known for bright, speedy streaks that can sometimes linger in the sky for minutes.

As several states report surges in animal cases, federal officials are warning about an apparent increase in human exposures.

Our genes evolved to fight ancient threats, but in the modern world, some of those changes may be turning against us.

Some monkeys become significantly more cautious about food sources that appear contaminated after experiencing deadly outbreaks of disease.

Certain viruses attack bacteria and can sometimes clear antibiotic-resistant infections. Researchers said they had tailored a virus to attack one patient?s illness.

Although Kosmos 2612 is now backing away, the maneuver raised alarm bells for analysts who see it as part of a pattern of Russian aggression.

Where did it start? How did it grow complex? Why did it get big? Three moments in Earth?s early history when evolution suddenly, inexplicably turned up the dial.

This summer?s heat was the continent?s deadliest by far this century, according to new peer-reviewed estimates.

From Brazil to the North Sea, economic interests have been edging out climate priorities this week.

Calley Means, who helped unite Robert F. Kennedy Jr. and President Trump, pushed food reforms but grew frustrated with stalled progress on the MAHA agenda.

If climate change continues apace, 96 percent of shallow coral reef ecosystems may collapse within 50 years, including in Australia?s Great Barrier reef.

The tech giant is funding one of the nation?s largest ?virtual power plants,? which would pay homes and businesses to adjust their energy use when grids are strained.

A southern cassowary at the Adelaide Zoo has laid eggs there for the first time in 34 years, after a carefully managed breeding process.

The agency replied two months later, saying it had ?competing priorities,? officials from a coalition of Western states said.

President Trump and Vice President JD Vance have dangled FEMA money to disaster-struck states during recent campaign rallies.

After years of bipartisan effort, the former Chiricahua National Monument, in southeast Arizona, has become the United States? 64th national park.

Elon Musk?s rocket company said its artificial intelligence spending had soared, but revenue more than doubled from its Starlink internet satellite service and A.I. products.

Spurred on by the Trump administration?s embrace of psychedelic medicine, researchers are experimenting with new ? and not so new ? forms of the anesthetic.

The dire projections come from the state?s Climate Change Assessment, which analyzes the impacts of changing weather patterns on the nation?s most-populous state.

A satellite image sent researchers to a remote Pacific atoll, but their findings brought no resolution to the decades-old search. Here?s what to know.

Trees are suffering one devastating epidemic after another, unleashed by insects and bacteria that enter the country because of global trade.

The mission, which launched on Monday, is headed to Phobos, the larger of the two moons of Mars. It could carry back the first samples from the Martian system.

Experts are reaching consensus on what the condition is. Now they?re debating how best to treat it.

Helen Branswell recognized the threat of the pandemic ahead of the vast majority of journalists and even medical experts. She was 69.

At Sotheby?s, a feast of rare science books includes volumes from Copernicus, Galileo and Newton that together revolutionized human understanding of the cosmos.

Earth?s rotation subtly changes the length of the day. Now our clocks won?t change with it ? at least not for a very long time.

The health secretary is quietly taking steps that public health experts fear will reduce immunization rates further.

Facing a flood of A.I. slop, groups bent on democratizing science create new checks and balances.

The Fields Medalist Terence Tao is on the front lines of a debate about artificial intelligence and the future of his field.

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