The moon has been bound to Earth for the vast majority of its 4.5 billion-year dance around the sun. Astrophysicists speculate that the moon's origin lies in an ancient collision, when a Mars-size ...

A bird call has gone viral and taken people who grew up in the 2000s right back to their childhoods. I remember the same sound waking me up as a kid and soundtracking my teenage years. I asked an ...