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Bar codes have grown up in a big way since they hit the market with a bang (or a beep) in the 1970s. Now all you have to do is whip out your smartphone and point it at the nearest 2-D bar code. It may contain a message just for you, dear consumer.
You'd be surprised how much thought goes into the disposal of sewage from space shuttle toilets. It may not surprise you that NASA scientists have that all figured out, but the solution will probably raise an eyebrow or two.