Sleeping underwater might sound peaceful — but for ocean animals, it’s a matter of survival. Some dolphins sleep with one half of their brain at a time, keeping one eye open to avoid danger and ...

In 1996, in an episode called “Messages from Earth,” part of the beloved sci-fi TV series Babylon 5, Captain John Sheridan (Bruce Boxleitner) confesses to his Minbari colleague Delenn (the late, great ...