T-shirt designs ©2010 their designers and are used without express permission. Photographs ©2010 Dave "The Knave" white and are under a Creative Commons Attribution Noncommercial Share Alike 3.0 Unported License (in other words, use 'em but please credit me and give me a link).
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You might want to check out the large size just to see how much of the shirt you can read. It's hilarious.
A Dinosaur Comics "Time Traveler Essential" shirts from TopatoCo.