15 Facts You Didn’t Know About Sharks

You've likely heard how sensitive sharks are to blood in the water. Predatory evolution has turned these sea dwellers into impressive smelling machines. Tests of olfactory reception and stimulation in some species have shown that they can detect as little as 1 part per million of blood in sea water. In terms of volume, that's like sniffing out a golf ball in the Loch Ness.