Research suggests that exercising in warm, humid conditions can provide what some call “poor man’s altitude training” — improving...

A seven-month-old receives a COVID-19 vaccine formulated for under-5-year-olds in Houston, June 22, 2022. Under Robert F. Kennedy Jr.,...

In an undated rendering from NASA, a concept image of a lunar surface nuclear reactor. Sean Duffy, the acting administrator of NASA, has issued a directive to fast-track efforts to put a nuclear reactor on the moon. (NASA via The New York Times) By Kenneth Chang Nuclear reactors have been generating power on Earth for more than 70 years. How hard would it be to place one on the moon to provide copious, continuous energy through the cold, dark, 2-week-long lunar nights? And co

Sandy Hupp, 71, trains at Greysteel Strength and Conditioning gym, in Farmington Hills, Mich., on June 20, 2025. Greysteel, a gym outside...

A view of the city during the cyclists’ ride, in Bogota, Colombia, June 26, 2025. At an altitude of 8,500 feet, Bogota is cool...

In an undated image provided by Tobias Wilhelm/State Museum of Natural History Stuttgart, an artist’s reconstruction of Mirasaura, which means “wonderful reptile” in Latin. German paleontologists have discovered a 247-million-year-old fossil of a reptile with a bizarre row of plumes sprouting from its back. (Tobias Wilhelm/State Museum of Natural History Stuttgart via The New York Times) By Carl Zimmer German paleontologists have discovered a 247-million-year-old fossil of a

Demonstrators stack mock coffins outside the State Department in Washington on April 17, 2025, to protest the Trump administration’s...

A frame from a video provided by Nadine Holmes shows an ocelot and an opossum together in the Amazon. Scientists are trying to understand footage that showed ocelots and opossums, usually predator and prey, hanging out together. (Nadine Holmes via The New York Times) By Clarissa Brincat Screenwriters in search of the next Timon and Pumbaa may want to look to the Amazon, where unlikely ocelot-opossum duos have been filmed hanging out together. Researchers at Cocha Cashu Biolog

A morning Tai Chi class at Elizabeth Street Garden in New York, on Sunday, June 11, 2023. Decades of research have established that...

Ian Otbot, 8, does his homework in his bedroom at home in Pennsylvania on July 15, 2025, as his father, Gerry Nel Otbot, looks on. Ian...