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"This is clear hack of the Matrix if we've ever seen one.\nIn the video above, YouTube user Brusspup shares an experiment with sound and water. \nHe first plays a 24hz sine wave towards a stream of water and records it using a camera set to 24 frames per second. At that rate, the camera's frame rate is synced up with the rate of the vibrations of the water, which makes the water appear to be frozen or still. \nHe then plays a 23hz sine wave sound towards the water, while keeping the camera's frame rate the same. Because the camera's frame rate is slightly different from the sine wave, the water appears to move backward.\nAlthough not shown, if you play a 25hz sine wave, it will look as though the water moves slowly foward."^^<http://www.w3.org/2001/XMLSchema#string>
<http://mashable.com/2012/04/19/water-flows-backward/?utm_source=feedburner&utm_medium=feed&utm_campaign=Feed%3A%20Mashable%20%28Mashable%29&utm_content=Google%20Reader>