There are two different ways humans become the way we are: influence from our environment and influence from our genetics. Genetics have a much bigger influence on who we are than most people think. There are the obvious things that genetics influence like intelligence, athletic ability, and the size of your junk. Yet there are many genetic traits that are much less obvious.
This is an encore of one of our previous lists, as presented by our YouTube host Simon Whistler. Read the full list!