Carotid artery disease is caused by a buildup of plaques in arteries that deliver blood to your brain. Plaques are clumps of cholesterol, calcium, fibrous tissue and other cellular debris that gather at microscopic injury sites within the artery. This process is called atherosclerosis.
Great white sharks may not be the world's biggest sharks, since that title goes to the whale shark, but they are the planet's largest known predatory fish. Whale sharks and great whites couldn't be more different in temperament.
Today, the largest shark roaming the oceans is the huge whale shark. Unlike the megalodon, whale sharks are not predators. Instead, they're slow-swimming giants that eat mainly plants and plankton. Although not the size of the megalodon, whale sharks are still really big. They can grow to be over 40 feet long and weigh over 15 tons, which makes them the largest fish in the world.