The Danuri spacecraft arrived in lunar orbit in Dec. 2022, and its first image dump is out of this world.
If you have the right vantage point, a rainbow might look circular. Here's the science behind why some rainbows look like arches and others don't.
Excessive sleepiness could be a sign of a condition known as hypersomnia.
A new study of ancient silver hoards from Israel and Gaza suggests that metal was used as currency in the Bronze Age, hundreds of years earlier than previously suspected.