Yes, sharks are horrifying killing machines. They’ve been on Earth for 450 million years, which is longer than trees have been around, and throughout their history many species have been (and still are) apex predators. However, the good news is that even though sharks can be dangerous to humans, most of the time they are not. The odds of being bitten by a shark are about 1 in 3.7 million. So you’re more likely to be hit by lightning, or to be bitten by Uruguayan soccer player Luis Suarez, than you are to be bitten by a shark.