Prejudiced people learn their ancestry via DNA testing

I thought this video was cool. The idea was to see whether or not people retained their nationalism and xenophobia once the results were in. I'm sure you can guess the outcome, but the video is still very cool:

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Of course, I'm left to wonder whether there really is such a thing as "German DNA"...

[edit]In fact, experts have pointed out the same issue I did.[/edit]