The human body is a marvelous machine, but like many machines that have evolved over time, it contains some leftover parts. According to the Mother Nature Network website, these leftover body parts appear to have lost their original uses: Appendix. This tiny pouch in the abdomen near the intestines may have been necessary when early humans survived on a plant-based diet. Today it seems largely superfluous, aside from being an unwanted storage place for bacteria. Wisdom teeth. A leftover... [read more]