While Tufte argues (convincingly IMHO) against pie charts http://www.edwardtufte.com/bboard/q-and-a-fetch-msg?msg_id=00018S, this one was sent to me by fellow scientist Andreas and I love it. He stated: “finally statistics I understand” – fishing of course. So I tried to elucidate the source. The oldest I found so far is at reddit http://www.reddit.com/r/pics/comments/71z9i/accurate_pie_chart_pic/ submitted by Jushooter. So credit to him! At reddit you can also peruse a number of  witty comments debating whether this picture is really up to snuff with regard to the “most accurate” property ☺.