Elund comments on 2014 Less Wrong Census/Survey - Less Wrong
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Sure. If I pick the same spot I get the same results. Esp. with a photocopy. But at least the significant difference between left and right hand remains. Even when photocopying it makes a difference how strong you press your hand against the plate and how much contrast the scan has (for me it was too dark to make out the creases clearly).
Maybe the corresponding fingers on your other hand really are different in length. Mine are. Whenever I press my fingers against each other such as to line up their bottom creases (keeping the orientation of the fingers as straight as possible), the middle and upper creases and fingertips don't line up. My right fingers are slightly shorter.
Good point about the photocopier. Hopefully these issues won't add too much noise to the results and obscure any significant results.