Meta-Fiction?

We know now that the ability to roll one’s tongue isn’t genetic and was based on some questionable research. So, is this a bit of very well done research, where someone in the 1970s would think this, or evidence of just another modern example of mistaken “fact”?

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“Drums Of Autumn (Outlander, Book 4)” by Diana Gabaldon –

“It might, he thought. If the ability to pass through the stones was genetic—something like the ability to roll one’s tongue into a cylinder or color-blindness—then why not?”

Start reading this book for free: http://amzn.to/2a0HSEp

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