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 10-metre-long basking shark (reremai, Cetorhinus maximus) is the second-largest fish in the world. Gentle giants, they can sometimes be seen from the coast swimming slowly near the surface of the ocean. Basking sharks open their mouths wide to catch plankton.