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Steep population declines in most countries are expected to have negative effects over the next several generations, but adaptation is possible

Deep-sea rocks packed with valuable metals may also be making oxygen in the deep, dark ocean—raising new questions about the cost of mining them.

Overcoming three recent failed tries, Elon Musk’s rocket company successfully flew its reusable jumbo booster and upper-stage Starship spacecraft

A new long-term study suggests that the more heat waves people are exposed to, the more their body’s aging process accelerates

Fresh results from near-infrared instruments foretell a bright future for finding life elsewhere in the Milky Way

Microplastics are seemingly everywhere—and now growing research suggests they could be breeding grounds for drug-resistant bacteria

This gruesome parasite is more of a threat to your burger than to you

In a rare move for a U.S. public official, Secretary of Health and Human Services Robert F. Kennedy, Jr., called for a paper that found no link between aluminum in vaccines and disease to be retracted. The journal rejected the request

Users’ Internet search questions can strengthen echo chambers, even on factual topics, but there are simple ways to lessen the effect

In honor of SciAm’s 180th birthday, we’re spotlighting the biggest “wait, what?” moments in science history.

A new wave of delusional thinking fueled by artificial intelligence has researchers investigating the dark side of AI companionship