How (and Why) SpaceX Will Colonize Mars Article Poster (By Litographs) (24"x36") $ 39.00
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Life is a Picture, But You Live in a Pixel Article Poster (By Litographs) (24"x36") $ 39.00
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Procrastination Series Poster (By Litographs) (18"x24") $ 29.00
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Religion for the Nonreligious Article Poster (By Litographs) (18"x24") $ 29.00
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Taming the Mammoth Article Poster (By Litographs) (18"x24") $ 29.00
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The Fermi Paradox Article Poster (By Litographs) (18"x24") $ 29.00
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Sizing Guide

Measurements are taken of the front of the shirt.  For example, a Men's Small says Chest = 18", which means it measures 18" from left to right of the front of the shirt.   The full shirt circumference = 36" (front and back combined).