Tying your shoes looks like a simple thing, but probably half the population uses a knot that is guaranteed to come loose several times per day. There is a simple fix.
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(After seeing this video someone called my attention to the cool video at http://www.youtube.com/watch?v=TKWL1md7Dv4
The final bow created in that video came out a square knot bow, but you still need to be careful to check. If you try it and it comes out a granny for you, reverse the first part of the knot.)
