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Twins are a great resource for scientists, because you can do some crazy things to one of them and measure the effects of your experiment against the “control”—the other one. Putting aside some of the darker moments in twinstory, just take a look NASA, who used astronaut twins Scott and Mark Kelly to see how space affects the body. The following examples of twin experimentation from Reddit are decidedly less scientific and decidedly more hilarious.

http://giphy.com/gifs/celebrate-twins-noise-makers-zujkOi1kkLRzG