Science writers rarely mention astrology, other than to moan when someone accidentally uses the word instead of astronomy. There is, of course, no scientific basis for astrology, but when we are considering history of science it is impossible to ignore astrology as many of the early astronomers earned a fair amount of their living doing a spot of astrology on the side. This didn't mean that they necessarily believed in it (though Roger Bacon, for example, makes an argument for it as an environmental influence, as opposed to a predictor of the future), but it brought in the cash and often the support of the nobility. The reality with astrology and other fortune telling approaches is that, even though it has no basis for working, inevitably some of the predictions will come true. If every single prediction didn't happen, it would actually be a very significant outcome - astrologers would be successfully predicting what wasn't going to happen. I was struck the other day when w...
I'm currently enjoying Tim Harford's three part series on Houdini on his Cautionary Tales podcast . Although best remembered as an escapologist, in the later part of his life, Harry Houdini included a section in his act that involved unmasking spirit mediums as fake. Earlier, Houdini had become friends with Arthur Conan Doyle, who became a fervent spiritualist and whose wife was a medium. Apparently, in one final attempt to persuade Doyle of the folly of his beliefs, Houdini did a demonstration for Doyle in his New York apartment. He hung a small blackboard from the ceiling out of reach, asked Doyle to to go out of the apartment and write a message on a piece of paper. When Doyle returned, Houdini got Doyle to stick a cork ball soaked in white ink on the board - to Doyle's amazement, the ball then wrote out his message (the Aramaic phrase Mene, mene, tekel, upharsin - mentioned in the Bible's book of Daniel) on the board. Houdini did this to demonstrate how the apparent...