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Unfortunately, there's no such thing as a fool-proof shark repellant. A curious product from England promises to "form a dense black cloud" when mixed with water, while a slightly more high-tech device emits a tiny electrical charge that sharks find discomfiting. Yet no product can guarantee protection from sharks. Every year, around 75-100 unprovoked shark attacks are reported, resulting in 10-15 fatalities. However, to put things in perspective, you are 30 times more likely to be hit by lightning than to be killed by a shark. You're far more likely to be injured driving to and from the beach. In fact, more
people die from dog attacks in a year than have ever died from shark attacks. So while you can't rely on any shark repellant to avoid attack, there are a few simple rules you can follow. Always swim in groups. Don't wander too far from shore. No shiny jewelry, and obviously no open wounds. And don't be assuaged by the sight of porpoises -- they share the same natural prey as sharks.
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