The great tragedy of science, Thomas Huxley once observed, is a beautiful hypothesis slain by an ugly fact. The great tragedy of science today, complain its champions, is its ugly and polarising politicisation. “Global warming” sceptics are compared to Holocaust deniers. Researchers using embryonic stem cells are called “baby-killers”. The left labels the right “anti-science” theocrats; the right says the left perverts science to serve its collectivist agenda. No beautiful hypotheses here.