Astronomy has been the subject of wonder and speculation for as long as historical records exist. As with all science, people got some things right - and, even with the best methods available, other things wrong. Since 2007, Alice Sheppard has run the Galaxy Zoo Forum, the discussion area for an online astronomy project with 300,000 members worldwide. She discusses some of the best and worst of astronomical history, and what ancient and modern mistakes are made today. We will hear the questions people have come to Galaxy Zoo with, the ways in which biases were found and dealt with by the scientists and participants, the beautiful and inspiring projects created by untrained people and the scientific thinking they learnt for themselves to apply.