View amazing photos of different types of sharks with this image gallery.

They are the most notorious species of shark, boasting 3,000 jagged teeth and a bite that kills. Yet some scientists say our fear of great white sharks is irrational, the product of a bad reputation they believe is inaccurate.

It's estimated that 100 million sharks are killed every year by humans. Some of these sharks are harvested for their cartilage, which is thought to contain cancer-fighting properties. Is there any truth to the claim?

Scuba divers, leave your bling at home. Don't wear yellow when you swim in the ocean. We hear all sorts of advice designed to keep sharks at bay. But is it legit?

You think you and your siblings don't get along? Try being a shark. You might not even make it out of the womb without your brother or sister eating you.

You don't reign supreme over the marine food chain without acute senses that can smell blood or hear injured prey from great distances. And sometimes a "sixth sense" doesn't hurt either.

Sharks have been around longer than the dinosaurs. After a few hundred million years, it's humans that might kill them off.

The most dangerous shark is the one speeding toward you, right? But if you had to pick a shark to swim with, it wouldn't be one of these bad boys.

The lure of a free meal is enough to get most of us moving and maybe even throwing an elbow or two as we battle for the last slice of pizza. Compared to sharks though, our feeding frenzies are tame.

They range in size from 8 inches to 60 feet, so obviously their food preferences will differ. Sometimes what seems like a good meal, isn't, so they spit it out. That includes humans.

Ever wonder -- as you're treading water in the ocean -- how a shark might hunt you down? They have a special sense that helps them locate prey.

If your ears picked up on a 40-hertz signal, you might wonder what the annoying sound was all about. But if you're a shark and you hear this "yummy hum," it might mean it's dinner time.

Sharks can have up to 15 rows of teeth growing behind their front row of chompers, so it's no surprise how many shark teeth litter beaches. But why do people collect them?

Even the most maniacally energetic people can appreciate crashing on the couch occasionally. Can sharks take the same break without dying?

The MythBusters attempt to discover a method to accurately guage a shark's size by simply looking at it.

Do sharks prefer yellow? The MythBusters find out.

The MythBusters see if shark skin really is equivalent to sandpaper.

The MythBusters find out if a shark really can detect a single drop of blood in a large pool of water.

You've heard the stat. You're more likely to be struck by lightning than be attacked by a shark. Still, wouldn't it be nice to know that your next aquatic destination doesn't fall on this list?

Perhaps you prefer a nice filet mignon with a red wine reduction, but according to one source, dogs are a shark's favorite meal. Where do they find pups in the deep?

If you want to attract someone's attention, you wave. But sometimes, wildly flailing about can bring the wrong kind of interest. Do flapping fish beckon to hungry sharks?

A shark is coming at you. It opens its mouth wide, bearing teeth. Will you be able to reach around and poke it in the eyes without losing an arm?

If it works for bears, can it work for sharks? If you're swimming alone, it might not be the best idea. But if you're surrounded by scores of thrashing swimmers, playing dead might help you escape the shark's notice.

Sharks scare us to death. What scares them? Magnets. Researchers have tossed magnets in the water and watched the sharks dart away. But what could be so repugnant about a magnet?

Burning ghost peppers is known to ward off elephants. Could chili peppers stave off sharks? The Aztecs thought so and dragged the peppers from strings through the ocean water.

It's scary enough to imagine a shark's toothy jaw snapping at your half-submerged body in the ocean. But the actual impact of its massive mouth clamping down? Surprisingly wimpy.

Many shark attacks, while deadly, are mistakes. So why do sharks attack humans? And how can you avoid being mistaken for prey next time you're at the beach?

"Jaws" scared movie audiences into staying away from the water. But for some, especially some free-diving abalone hunters, a bloodthirsty shark isn't just a story.