It's a fuzzy-headed and bleary-eyed edition of Science Weekly. We hear James Randerson get high as he takes part in an experiment to test the impact of THC (the main psychoactive ingredient in cannabis) on the human brain. James remains 'slightly slow on the uptake' for the rest of the show. Just say no, kids.
Away from the drugs, the Natural History Museum's Dr Sandy Knapp joins us in the studio to talk about the 300th anniversary of Carl Linnaeus' birth. As the botanical secretary of the Linnaen society, Sandy knows a thing or two about the man who invented the binomial classification system - as well as an exotic way of measuring temperature.
Also in the show, we hear from the astronomer royal Sir Martin Rees and Prof Richard Dawkins, who took part in this year's Guardian Science Experiment at the Hay Festival which asked: Have we abandonned the enlightenment? We have exclusive interviews with [Listen Now] Prof Dawkins and [Listen Now] Prof Steve Jones, who also took part in the debate, as your double dose of Science Extra.
Elsewhere, resident webtwopointologist Bobbie Johnson explains MicroSofts' latest attempts to take over the computer world, and why the founders at Last FM are scrobbling all the way to the bank. And Ian Sample tells us about a new theory about human evolution, and the controversy over Champix, the anti-smoking drug that's about to become available on the NHS.
