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.
Whale sharks are the largest known species of fish, growing to 12.5 meters and can weigh as much as 79,000 pounds. The whale sharks here in La Paz are often 7-10 meters in length. The fish can live as much as 70 years. The species originated about 60 million years ago.