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A physics-based sperm-screening technique could offer a more accurate at-home test for people trying to conceive

High vaccination rates eliminated measles in the U.S. An outbreak that began in West Texas is threatening to overturn that status.

AI chatbot companions may not be real, but the feelings users form for them are. Some scientists worry about long-term dependency

In 2024 disasters displaced a record number of people both globally and in the U.S. About 11 million U.S. residents had to relocate to another part of the country because of hurricanes, floods and wildfires

Astronomical amounts of energy could be extracted from black holes—to build a gigantic bomb, for example. Experts have now implemented this principle in the laboratory

Weather experts warn that staff cuts at the National Weather Service that have been made by the Trump administration are a danger to public safety as tornadoes, hurricanes and heat loom this spring and summer

Businesses are making moves to avoid consumer warning labels, and the effects reach far beyond California

The tick that causes Lyme disease can also spread babesiosis—and researchers fear doctors in the mid-Atlantic don’t know about it

Parents often struggle with the news that their child has a major health issue. Learning how to manage new routines and expectations is key to everyone’s happiness

Critics say U.K. investment in research on climate-cooling interventions, such as refreezing sea ice and brightening clouds, distracts from the need to cut planet-warming emissions

Pugs, Persian cats, and other smushed-face cats and dogs are more similar to one another than they are to the wild animals they evolved from

A new mathematical model helps to advance the centuries-old art of knitting

A spacecraft is set to fall from the skies, 28 U.S. cities slowly sink, and a new study pinpoints how the overindulgence of the wealthy contributes to massive warming. 

Scientists at Europe’s famous particle collider briefly created gold ions from lead in a modern twist on the alchemical goal

Young people today will be exposed to a number of heat waves that no one would have experienced before the burning of fossil fuels started raising global temperatures

The sun has produced stunning auroras on Earth in recent years as solar activity has peaked—but expect more in coming years

The Hospital Preparedness Program helps hospitals and emergency managers save lives in wildfires, tornadoes, pandemics and other mass-casualty events. The Trump administration has proposed cutting it

A new review of ocean data suggests that more than 99.999 percent of the global deep seafloor has never been seen by humans. But what does that really mean?

Inuit languages really do have many words for snow, linguists found—and other languages have conceptual specialties, too, potentially revealing what a culture values

Conceptual problems, ideology clashes and xenophobia prevented the concept of zero from catching on for a long time. Today all mathematics is based on it