Once dismissed as sticks and forgotten in a museum, the 5,000-year-old tools show prehistoric people hunted whales far from the Arctic.

Hydrogen cyanide, a toxic chemical, may have helped spark the chemistry that led to life. When frozen, it forms crystals with highly reactive surfaces that can drive unusual chemical reactions, even in extreme cold. These reactions could produce more reactive molecules that pave the way for life’s basic ingredients. The findings suggest frozen worlds may be more chemically active than once thought.

Ted Judah went diving off McAbee Beach in Monterey Bay when he caught sight of a 'silvery knife blade undulating thing,' later identified as a king-of-the-salmon.

Conservationist Christina Hicks explains the tension between protecting marine life and depending on it for food, and how our seafood choices ripple across the world.

Bob Croft, the Father of American Freediving, has died at the age of 91. A U.S. Navy diver, world-record holder, and educator, Croft played a defining role in the early development of freediving in the United States and remained a respected figure in the global diving community.

A new scientific assessment finds California's Sacramento-San Joaquin River Delta is in poor ecological health, and that a big reason is the amount of water being pumped out.

On a Bahamian island, in a landlocked lagoon, the planet’s densest collection of seahorses is offering scientists new insights into the secret lives of one of the world’s most mysterious fish.