Or do think there's something special about the person that makes them flip tails more often?
Yes, that’s the conclusion that the scientist has come to. The chance of getting 20 in a row is so extraordinarily unlikely that it’s reasonable to conclude that the chance is not 50/50 for that particular surgeon.
https://content.gitbook.com/content/egsIWleSdyH9rMLJ8ShI/blobs/xxfDEN1b4KipvOxna4wP/Flutter-Coding.pdf