I was curious about the question about paper folding disscussed in the lecturea and I was still confused about the question why can't a paper be fold more than 7 times. why why why?????
Therefore, I searched on Internet for the solution.
The soultion: If you have a normal sheet of notebook paper and you try to fold it in half multiple times, you probably cannot get it to fold more than 6 times. Maybe 7 if you are really strong. That maximum limit is caused by two things:
1) The number of layers of paper doubles with each fold. So you start with a single layer, then you have two layers, then four, then eight, then 16, then 32, then 64 layers after six folds. Maybe if you are very strong, and you use a pair of pliers, you can get to seven folds and 128 layers, but it probably won’t be pretty.
2) At that point the sheet of paper is so small, and the number of layers so large relative to the small size, and the distortion caused by the folds so great, that there is no way to fold it again. You can’t apply enough leverage, and the fibers of the paper do not have enough flexibility for another fold.
There is a link to a video on YouTube prove this explanation.
http://www.youtube.com/watch?v=kRAEBbotuIE&feature=player_embedded
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