Explain why so many sharks attack human, are they defending themselves?

According to researchers, sharks are only dangerous when you're injured or "mistaken" for food. I've also heard that the Tiger shark is one of the few animals which actually consider a healthy human as prey and will stalk and hunt you down, then eat you completely. Is this true and, if so, are there other animals that behave this way?That said, it is...

North Korea threatens to sink US aircraft carrier
Explain why it’s more common for older people to get heart attacks?
Explain why some older people get alzheimers?
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The student news site of Fillmore High School
The student news site of Fillmore High School