This is a very useful skill, because often there's no can opener to be found.
In fact, there were fifty years when cans HAD to be opened without a can opener.
"The first tin cans, invented in 1810, were heavy-weight containers that required ingenuity to open, using knives, chisels or even rocks. Not until cans started using thinner metal about 50 years later were any dedicated openers developed."
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