Shark diver Mike Rutzen: Sharks form a social hierarchy better than any military.

Edith Widder: Bioluminescence has evolved 40 to 50 separate times in history. What makes it so important to animals?

Fred Grassle: The rate of discovery of new species in sea mud is a steep graph up.

Mike deGruy: “I first fell in love with marine life when I picked up a grey octopus and it turned chocolate brown.” Watch Mike deGruy’s TEDTalk >>