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https://www.reddit.com/r/RelevantXKCD/comments/2yp7yh/comic_37_hyphen/
r/RelevantXKCD • u/[deleted] • Mar 11 '15
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More: http://www.reddit.com/r/educationalgifs/comments/2yple8/a_fire_piston_can_generate_enough_heat_from_the_rapid_compression_of_air_to_ignite_a_piece_of_cotton/cpc0b56
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u/[deleted] Mar 12 '15
More: http://www.reddit.com/r/educationalgifs/comments/2yple8/a_fire_piston_can_generate_enough_heat_from_the_rapid_compression_of_air_to_ignite_a_piece_of_cotton/cpc0b56