New teeth for Calif.'s great white shark tourism? (Reuters)

OFF THE FARALLON ISLANDS, California (Reuters) - "Over there -- shark!" After nearing the Farallon Islands, 26 nautical miles (48 km) west of San Francisco, the boat's captain shouts out. A slick of dark red seal blood spreads across an ocean surface slashed by the occasional bobbing of a great white shark fin. For a small group of shark enthusiasts, the adventure was only beginning. It was time to don a wetsuit and enter a cage the size of an elevator to view one of nature's fiercest predators ...