Forget squashing butterflies. Don't wash this shirt.

If you don't have time travel planned in your future (past), this shirt is also really valuable in case of apocalypses where the human race has to basically start from scratch. Your shirt will get us well on our way.

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Forget squashing butterflies. Don't wash this shirt.

From the mouth of Ryan North (best known for Dinosaur Comics):

This shirt has how-to information on all of the low-hanging fruit of our modern age. Go back in time wearing this and you'll invent heavier-than-air flight! YOU'LL discover penicillin. YOU'LL be the first to isolate aluminum. Did you know aluminum used to be more valuable than gold? YOU'RE GONNA BE RICH.

How stuff works detailed on the front of a chocolate brown, 100% cotton shirt. Note that this shirt fits differently than our normal shirts. Please click on the Sizing Info tab before selecting a size.

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