Whalers pursued sperm whales for the rich oil in their oversized heads. Now biologists are on the tail of these deep-diving, long-lived, sociable and mysterious sea creatures. Gerard Soury ...

How deep is an Olympic diving pool? The pool into which Olympic divers dive (also known as a diving well) must be a minimum of 5m (16ft) deep. Why do divers use showers and hot tubs after dives? In ...