The human body is always fighting off infectious diseases such as bacteria, viruses, or parasites that want to take over cells. While cells in the body my fall to these enemies and be taken over, germ cells (sperm and egg) have a unique way of fighting off these little beasties. It turns out that to protect genetic information and pass it on accurately, germ cells have what is called piRNA. PiRNA is found mostly in the testes and ovaries and protects germ cells by subduing genetic sequences of intruders. This is a cool discovery and can maybe be used to create something like piRNA that we can use as medicine to cure sickness caused by some bacteria, viruses, and parasites.