Scientists have carried out research into how a pint keeps (or loses) its head (BBC News Online). One of the scientists involves speculates that the long-lasting creamy head on Guinness might be the result of “a little surfactant”. Eugh.
The article also asserts that “the foam on a pint of lager quickly disappears”. Well, perhaps on a pint of Fosters in a dirty glass, but the head on a glass of lager in Germany sticks around for quite some time. And they’re not using “surfactant” – the sinister and secretive arbiters of the German Beer Purity Law wouldn’t stand for it.