(Inspired by this thread, for which I was researching Down syndrome. However, I couldn’t find a cite to substantiate what I wanted to post.)
One of several diagnostic features of Down Syndrome is the straight crease across the palms of the hands. As I have these creases, but am fairly sure I do not have Down Syndrome*, I’m curious as to how common they are in non-Down people and what other significance they might have.
*After all, I have multiple degrees and get invited to join Mensa after taking a GRE.