Science

It was in his play Back to Methuselah that George Bernard Shaw honoured a lesser known aspect of Charles Darwin’s originality as a thinker, when he described him as ‘an intelligent and industrious pigeon fancier’. Britain’s greatest natural scientist was indeed a keeper of fowl, with pigeons among his favourites. The habit arose from Darwin’s instinctual recognition that in the animal-rearing experiments conducted over millennia by our ancestors, we had inadvertently stored away crucial evidence about the way in which all of life can change in response to environmental stimuli. It was part of his world-changing insights that he proposed how all the 200- plus pigeon breeds recognised in Victorian

When Peregrine Worsthorne was on Desert Island Discs in 1992, he chose as his luxury item a lifetime supply of LSD. He may, according to the American journalist Michael Pollan’s fiercely interesting new book, have been on to something. Acid has a bad name these days: either a threat to the sanity of your children, or a naff 1960s throwback favoured by the sort of people who sell you healing crystals at markets in Totnes. Yet in LSD-25, psilocybin, DMT, mescaline and others we have a family of molecules with startlingly powerful effects on the human mind. They are not addictive, carry little or no physiological risk, and their association