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.
LOS ANGELES â Megalodon, the most massive shark ever to prowl the oceans, may have gotten so big that it was prone to extinction. For some mysterious reason, though the biggest and smallest members of the species were the same length, many of the giant sea monsters got longer over a 14-million-year period, and then, they all went extinct, new research suggests..