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5 science mistakes in movies and TV you should unlearn – CNET

CSI

Koboldt watched an episode of CBS show CSI that involved taking a DNA sample and predicting what a person will look like. (Disclosure: CBS is CNET's parent company.)

You can't do that in real life. "As a geneticist, we could probably tell you with some certainty -- just as 23andMe Ancestry could tell you -- what the likely ancestry is of the DNA sample," Koboldt says.

"But it would be very difficult to predict their exact appearance based on that, because a lot of these are very complex traits."