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The recent spate of shark attacks has left many beachgoers nervous.
Dr. Samuel Gruber, the director of the Bimini SharkLab research facility in the Bahamas, says the spike in attacks suggests something strange is going on.
"The trend is normally zero or one attack in that area in any one year," said Gruber.
Theories as to why this is happening range from time of day, to bait fishing, sea turtle migration, lunar cycles and global warming.
In 1924, German neurologist Hans Berger discovered a way to read brain waves by developing what’s known as an electroencephalograph (EEG). And, soon after starting his research, Berger noticed that the electrical activity of each brain wave is correlated to a person’s emotional state of mind.
Since sharks have been measured to sense frequencies between 25Hz and 50Hz, which are also related to the emotional status of anxiety and fear, could sharks also feel these brain waves in proximity? 
In the Great White Sharks 3D movie that plays at IMAX theaters, free-diver William Winram says he believes sharks can pick up on a person’s anxiety and fear, and that is what often triggers an aggressive response. Winram observed this sensation while tagging Great Whites for scientific research by holding his breath and free diving with them. You can find many videos on YouTube in which he calmly swims alongside Great Whites, without fear, anxiety nor incident. This would seem to be a very interesting question for future scientist to pursue.
originally posted by: AutumnWitch657
a reply to: lostbook
You give too much credit to the relatively stupid shark. In the words of Matt Hooper "all they do is swim and eat and make little sharks"