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.
Tiger sharks tend to measure in the 10 to 14 foot range, with some exceptional individuals approaching 15 feet. The largest tiger shark ever recorded was at least 17, perhaps 18 feet long. Some claim that even larger tiger sharks are out there.