How a car's differential works

I bought the T-shirt, and my biggest problem with it by far is that “You can do a neat trick with C20H26O2!” would be an utterly useless piece of advice even to chemists today, i.e. since there is an astronomical number of compounds that fit that description. But eh, it looks cool, and a useful synthesis for progesterone from Dioscorea probably won’t fit conveniently anyway.

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