God I keep coming back to them using photos of twins for the children. Imagine taking this study. You're shown a photo of a kid. Does he look more like a John, Paul, George, or Ringo*? You click John. Two photos later you're shown the same goddamn kid. Does he look more like a Matthew, Mark, Luke or John*? You figure the test is bugged or something, so you click John again. OOPS, actually those two photos were identical twins, so you're guaranteed to have gotten one wrong! Does this affect the results? Who knows? * (imagine Israeli equivalents)
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