This apparatus has one drawback: One doesn't have any incentive to exercise. To make it more interesting they should hook up the bike to a dynamo whose output powers the computer. If you want to browse the web you've got to pedal!
I've read you can make any kind of gate with a combination of NAND and NOR gates. Since they can "produce and invert". But I haven't got that far into it to understand it.
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