In 1972, the Pioneer 10 space probe began its journey across and ultimately out of our solar system. On board was a golden plaque designed to communicate to aliens what humans looked like, that we were intelligent, and where we lived. One of the symbols on that plaque conveyed specific information about hydrogen. Anderson Fernandez of Brazil decided to tattoo this symbol on his arm.
Link | Images: Geeky Tattoos | Previously: We Sent Aliens the Wrong Star Map!