Sad news: Lynn Margulis, advocate of the endosymbiosis theory of eukaryotic origins, has died. She was smart, creative, and promoter of a lot of wild ideas…and to her credit, some of them were even right. I think her greatest strength was her eagerness to step right out to the edge of science and push, push, push — sometimes futilely, but sometimes she really did succeed in pushing back the frontier a bit.

(Also on FtB)