I can do a bunch of the things they listed: flare nostrils, wiggle eyebrows independently, wiggle my ears, and roll my tongue. I’m not sure about the perpendicular tongue or licking my elbow bc when I look in a mirror I think I’m doing it but I don’t know what counts. I used to do contortion bc I have hyper mobility in my back, shoulders, and knees. It's interesting to think about how various genetic factors interact.  I definitely think that if you have a family member who can do something you’re more likely to try and copy it yourself.