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Experts question this study’s design and its recommendations—and point out that you probably get more exercise than you think

Gold doesn’t tarnish like similar metals do. A new paper says that the key is the intricate “herringbone” pattern of its atoms.

This year’s expected El Niño could hamper hurricanes in the Atlantic but boost them in the central and eastern Pacific

While drugs such as Wegovy target a single gut hormone, retatrutide is among a new class of GLP-1 drugs that aims at three hormone receptors

A chatbot’s result for the 80-year-old “unit distance” conjecture is the first AI proof that would likely be published in math’s top journal if humans had done it alone

This eerily simple math says our days are numbered—and nobody can agree why it’s wrong

Friday’s flight could be the most pivotal test of the Starship megarocket

The wobbly, lanky arachnids known as harvestmen or daddy longlegs may be overlooked as predators of small vertebrates such as frogs, researchers say

The science of de-extinction does not exist, but Colossal Biosciences’ “artificial egg” is an interesting technical feat

The Trump administration warned that too much screen time for children has been linked to poor sleep, bad behavior, and less physical and social activity

A deadly Ebola outbreak in parts of Africa is raising international alarm. Still, experts stress that the chance of a pandemic is low

New trove of fossils reveals that ancestral animals likely emerged in the deep sea

A decade after Ebola vaccines changed outbreak response, a new epidemic in central Africa is caused by a strain the world never fully prepared for

NASA’s Psyche snapped images as it flew by Mars last week. The spacecraft used the planet’s gravity to give itself a boost on its journey toward its target asteroid

Denver’s hockey team is studded with stars, but training and playing the game some 5,000 feet above sea level may give their athletic performance a boost over that of their rivals

Nuclear power could enable long-term lunar missions, but NASA’s timeline may be too ambitious

Some extinct human ancestors and modern-day apes appear to share wrist traits that raise the question of whether our last common ancestor walked on its knuckles

A Bermuda high parked over the western Atlantic is pulling sweltering air up from the south, challenging records in parts of the eastern U.S.

March was a scorching 9.35 degrees Fahrenheit hotter than the 20th-century average for the month, capping the hottest 12-month stretch for the U.S. since records began in 1895

SpaceX is now targeting the evening of May 21 to launch the latest and largest version of its Starship megarocket for the first time