note to moderators: didn't know where to post it, so move if you want
A simian crease is a single line across the palm of your hand, as opposed to the "normal" three lines. about 1 in 30 people have at least one of them.
http://www.handanalysis.com/simian1.jpg
A recent online survey I took, showed that many people with a simian crease have frequent lucid dreams, So I wondered how many people in the lucid community have them, and how many of those are "natural" lucid dreamers.
I have one: on my right hand, and I'm a natural lucid dreamer.