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hehe, on some of the comp's with better pc speakers the frequency could go so high that it became hard to discern whether or not you could still hear it.
KrazyKemist actually took the time to make a program that cycled the sound frequency while flashing multi-colored shapes on the screen. Gave quite a headache in a fairly short amount of time.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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