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.
The gentle giants take surprising road trips to faraway destinations, scientists discover. Whale sharks are the largest fish in the sea, yet there is much scientists don't know about them. Move over Mary Lee, there may be new celebrity sharks in town.