How can you tell if there's a shark nearby?

I am horribly afraid of them and I get paranoid whenever I am in the ocean ever since I found a baby shark a couple months ago in the shallow of the ocean, which means the mother must've been nearby. Anyway, my cousin read in some book that whenever the water is clear and the waves are calm, yet occasionally a... show more I am horribly afraid of them and I get paranoid whenever I am in the ocean ever since I found a baby shark a couple months ago in the shallow of the ocean, which means the mother must've been nearby. Anyway, my cousin read in some book that whenever the water is clear and the waves are calm, yet occasionally a very big one comes by, it means a shark is somewhere near. Please help?
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