I sat in on a short science lesson first period at my elementary school, as I didn’t have any classes. The homeroom teacher was explaining base mass units using a crude balance made from plastic cups and a ruler. The first experiment was determining which was heavier, a pair of scissors or a glue container (the scissors won). Next she used 1 yen coins, which conveniently weigh 1 gram each, to determine the weights of common classroom items. Did you know a 10 yen coin weighs 5 grams? Well, now you do.

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