In the film Shanghai noon, Chon Wang (Jackie Chan), a Chineseman in the US and his new-found friend, Roy O'Bannon (Owen Wilson) a small-time robber, are trying to escape from an old-style Wild West jail which has metal bars from ceiling to floor. Wang does a very odd thing. He takes off his shirt, tears it up into strips and urinates on them. Holding them up he proclaims: 'when the shirt gets wet it doesn't break'. Then knotting some of the cloth around a pair of prison bars and using a broken -off wooden chair leg as a lever, he tightens the knot which bends the bars so he and his mate can get through and escape! So is this possible? Is wet cloth really stronger than dry cloth?

I then tested strips of cotton by hanging weights from them made from buckets which I could slowly fill with water (not urine) to make them heavier. On average, a heavier weight was required to break the wet cloth than the dry cloth. So the wet cloth did seem to be stronger. Also the leverage obtained by the cloth knot and wooden stick was enough to bend a steel bar 2.4 m long, similar to those used in the jail in Shanghai noon. (Note: I don't think the jail-break stunt would have worked if there had been a horizontal bar welded about halfway up, as is the case in modern jails.)


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Recently, I was giving an end of conference talk to a group of professional scientists. Just for fun I described the Shanghai noon clip and asked them what they thought about the hydrogen bonding idea. I was amazed at the debate the question started. Some scientists thought the hydrogen bonding would be significant while others were equally adamant it could not be. e24fc04721

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