I'm skeptical. What evidence is there?

Asking questions that imply you've never bothered to read anything about the topic isn't a good way to try to get other people to engage with you.

But if you're looking for a brief overview, you could read https://www.amazon.com/dp/1444791877/

Evidence that's built on "statistical correlation" is very weak. A correlation coefficient of 0.6 or less is practically non-predictive. The people in this area need to use better mathematics.