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Amaze your friends by sending them secret messages, hidden in 3D stereograms.A 3D stereogram (SIRD) is a seemingly meaningless image with a repetitive …

A 3D stereogram (SIRD) is a seemingly meaningless image with a repetitive pattern. But with some training you can reveal hidden 3D shapes within the i …

To get a good score you need a good ear for music, a good memory and a sensitive wrist. First, you hear a tone to remember. Then you adjust the pitch …

To get a good score you need a good ear for music, a good memory and a sensitive wrist. First, you hear a tone to remember. Then you adjust the pitch …