Hanny van Arkel was 24 years old and teaching primary school in Heerlen, the Netherlands. She also played guitar and during summer vacation back in 2007, she was noodling around on the website of a famous rock guitarist named Brian May. Brian May got famous in the middle of a doctorate in astronomy on interplanetary dust, so his website had links to astronomy websites, and Hanny clicked on a new site called Galaxy Zoo. A week or so before, Galaxy Zoo had posted a million galaxy pictures and asked the internet to please classify each one according to whether it was a spiral or an elliptical or something [...]