If @davidjmackay had in 1910 done back-of-envelop calc on correct prediction of 2010 car ownership wd he have deemed it unrealistic? #srms15
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@MForstater@DavidJMacKay@Eaterofsun@davidjcmackay Oh yes thanks. That makes a difference :-)Thanks. Twitter will use this to make your timeline better. UndoUndo
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