阿
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可
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阝
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Auntie, Albert Einstein and the Pope are having a contest in front of the ashram: Who can sit longer on a bed of nails? The Pope secretly calls God's power and just hovers a little over the bed of nails. Albert Einstein calculates exactly how he has to place his body to not excert too much force on any body part. Auntie just sits down on the bed of nails, and wins in the end.
亨
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亠
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口
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了
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Mnemonic symbol: American scientist Joseph Henry.
Before Henry (亨) invented inductance he used to hang out with Hamlet (h) a lot in front of the engine ((e)ng1). One day he observed Hamlet shifting a mandarin (口) from a price cup (了) to a beret (亠) and vice versa, which gave him the idea of putting an iron core into an electromagnet.