The struggle of science against stupidity (and, in some cases, selfish interest groups) is being fought out on a number of fronts – creationism, global warming and passive smoking to name but a few. Tomorrow the venue moves to Toowoomba where a proposal to deal with a drastic water shortage by recycling effluent is being opposed by a know-nothing scare campaign, whose proponents have neither credible arguments nor an alternative to offer. I’m happy to endorse people’s freedom not to drink recycled water if they don’t want to. Their local supermarket offers chemically identical spring water at around $1/litre, so if they don’t want to drink what comes out of the tap at $1/kilolitre, they don’t have to. But they shouldn’t make their fellow-citizens suffer for their irrational squeamishness.