A new study led by Canadian researchers suggests the human brain emits a faint glow that varies with activity.

Captured north of Ash Fork, Arizona, the image's ancient light was collected using a Sky-Watcher Esprit 80 mm telescope and a Player One Poseidon M Pro camera. Meyer employed narrowband filters and ...

Many of Earth's critters have the ability to emit a visible glow, but humans aren't usually considered among their number.