Strangely, a rare extra rib, as the diagram shows, actually turns up near the neck. They're often different sizes, and the large ones can create comfort and mobility problems if they get too big in the wrong place. Do you know anyone with this extra rib?

Back when living things had gills, the preauricular sinus, was common. But like that tendon from when people climbed trees, over time the trait has pretty much disappeared. But one in twenty people still have it. Are you or do you know someone who has this?

If you're not a morning person, you might be able to blame genetics for not blessing you with "basic helix-loop-helix family, member e41 (called BHLHE41 or DEC2)." The rare gene allows you to cycle through the sleep process faster than others, meaning you just need less sleep. Margaret Thatcher, Salvador Dali and Nikola Tesla all had this gene, and produced great work from the extra time awake. Do you or do you know someone who has this?

Distichiasis is a rare disorder that basically is just an abnormal growth or even a second set of eyelashes. There can be irritation if the lashes are too close to the eyes, but it's an easy fix, and can be quite striking. Just ask Elizabeth Taylor who had this disorder. Do you know anyone who has this disorder?

In 1961, doctors discovered a rare mutation that leads to a blood type called Rh-null. It's called "golden blood" because it can donate and match with any blood type. The catch? It's EXTREMELY rare? Right now there are only 10 people in the world who have it. Are you or do you know anyone among those ten?