Why did so many European monarchies resort to inbreeding and what did cousins hooking up have anything to do with one of the darkest periods in European history? Check out today's epic new video to discover why royal inbreeding was the direct cause for some of Europe's worst years.

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📝 SOURCES:https://www.bbcearth.com/news/....what-are-the-effects
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https://owlcation.com/humaniti....es/The-Habsburg-Jaw-
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