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The Drake Equation T-shirt
The Drake equation t-shirt is a probabilistic argument used to estimate the number of active, communicative extraterrestrial civilizations in the Milky Way galaxy. The equation was written in 1961 by Frank Drake, not for purposes of quantifying the number of civilizations, but as a way to stimulate scientific dialogue at the first scientific meeting on the search for extraterrestrial intelligence (SETI). Some people may consider this a funny t-shirt, but not me! As Mulder from the X-files would say ” I want to believe”.