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I remember this site from the beginning of the Internet - nice to see it still going!

An excellent web site! I first came across it when the topic of my PhD thesis was noted as a half-baked idea! (http://www.halfbakery.com/idea/gait_20recognition).

Would it be easily fooled with silly walking like smiling does for facial recognition?

If I remember correctly, the Chinese have a product that uses this. It's built into floor tiles.