“I wish I had the voice of Homer/ To sing of rectal carcinoma,/ Which kills a lot more chaps, in fact,/ Than were bumped off when Troy was sacked.” This was the opening stanza of a comic poem which appeared in 1964 in the New Statesman. The man who wrote this was dying of cancer and yet the deadly disease had failed to repress his indomitable irreverence. An exceptionally gifted man, John Burdon Sanderson Haldane, was not just a preeminent biologist who was a founder of population genetics, but also a brilliant orator, prolific science populariser and much else.