Knee-deep in a river of northern Thailand, scientists scooped up some sand with a net and sifted through it. Hidden between ...

Mayflies don't bite and adults only live for a day, but you don't want to get stuck in a swarm. Here's what to know about the mayfly insect.

Scientists scooped sand from a riverbed in Thailand and found two nymphs of rare mayfly species not seen in 22 years, a study said. Photo from Kwanboon and Boonsoong (2025) Knee-deep in a river of ...