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The disappearing great white sharks

Scientists are not sure why their numbers are down near South Africa
False Bay, near the South African city of Cape Town, is one of the world's great spots for watching great white sharks. But for a while now there have been no sharks to see, and scientists don't seem to know why. Gregg Oelofse is head of coastal management there 

(Picture: Great white shark.  Credit: Science Photo Library)