Megaflash hot spots include the U.S. Midwest and southeastern South America, site of the previous record-holder, a 709-kilometer-long bolt over parts of Brazil and Argentina. That lightning still ...

Geologists unpack why the magnitude 8.8 temblor — the sixth largest ever recorded — fomented waves that reached Japan and Hawaii but caused little damage.

A leftover from microbes’ meals is linked to early heart disease in people. In mice, it contributed to plaque buildup in the arteries.

A quantum computer has reached new heights. The first quantum computer in space is now orbiting Earth on a satellite, scientists report. Launched on June 23, the computer had to be designed to fit in ...

Studies suggest that people who had seasonal flus or vaccinations have low antibody levels against H5N1 bird flu.

Seeing sick-looking faces in virtual reality triggers brain circuit changes related to threat detection and boosts activity of certain immune cells.

An infinity symbol–shaped galaxy hosts an active supermassive black hole. The growing giant may have come from the aftermath of a galactic smashup.

Drone footage from Norway shows killer whales using a highly coordinated and cooperative hunting technique to catch herring.

Maggots on rotting meat may have given Neandertals’ a fatty, nitrogen-rich boost, a study of their bones suggests.

Dropping vaccination rates and changes in U.S. vaccine policy have public health experts concerned that annual measles outbreaks could become more frequent.

An analysis of 57 studies shows that people who walked a certain number of steps were less likely to die from any cause compared with those who walked less.

GLP-1 drugs for diabetes and weight loss are difficult for some people to inject weekly. A new slow-release gel, tested in rats, could help.