An interesting side effect

In Europe, in the XVI century, during the craze of chocolate, he attributed magical and curative properties. Naturally, expectations were not realized, and then it was seen as just a source of all evils. One young woman wrote to her friend: "I advise you do not have chocolate. My friend ate it during pregnancy and gave birth to a completely black child »
Mdja. And if you eat a strawberry - therefore, red. And, God forbid, Blackberry, born cyanotic. Well, now everything is clear. And then I broke my head about the origin of races.