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Batteries

You guys know about this trick about replaceable hearing aid batteries, right? If you don't have a device for testing, you can just bounce the battery on a table-top. If it bounces, the battery is depleted. If it lands "flat", it's still good. 

Tape Deck

Does anybody else walk around with a tape deck in their head? Effectively, play, stop, rewind and fast-forward? I've had this ability as...