4. Wisdom teeth
Early humans had to chew plants in order to get enough calories to survive, but these days only about 5% of the population has a set of these healthy yet useless teeth. We hope this one will be the first to disappear from the list — less dental bills!
5. Neck rib
© Wikipedia Commons
A set of cervical ribs, possibly a leftover from the age of reptiles, still appears in less than 1% of the population. Some people have it only on their left or right side, while some have both. They often cause nerve and artery problems.