The biggest stories of the day delivered to your inbox.

Ever wondered why the moon looks different tonight than it did last night? It's not random; the moon is actually moving through a cycle of eight phases known as the lunar cycle. The cycle lasts around ...

Most animals, including humans, carry an internal lunar clock, tuned to the 29.5-day rhythm of the Moon. It guides sleep, reproduction and migration of many species. But in the age of artificial light ...