Leaders of the pack RACING cyclists often ride in packs so they can reduce wind drag. But some say that this gives poorer cyclists an unfair advantage, as they can tag along behind the leaders. Now Graeme Ackland and David Butler of the University of Edinburgh have put together a mathematical model that describes how this clumping happens. Cyclists … News
Technology Like human, like machine Haley Joel Osment and Jude Law in the film AI
 I AM standing under a tree, looking at a squirrel on a bough above my head. The squirrel is looking at me. Eventually it decides to leave and swarms away, its action like a trigger, its tail following the parabola of retreat. It is a … Opinion
The Countess and the cure In 1638, the beautiful Lady Ana de Osorio, Countess of Chinchon, had held court in her husband's palace in Lima for nine years. As wife of the Viceroy of Peru, her life had been one long whirl of balls, banquets and fiestas. But now she lay on her sweat-soaked bed stricken with malaria. The Count … Features
The great escape IT'S a wonder any of us are born. The womb seems a cosy place, but an unborn baby is essentially a foreign body inside its mother. Our immune system ferociously defends us against anything it recognises as "alien"—witness the constant threat of organ rejection faced by transplant patients. And yet we all made it into … Inside Science
Feedback WONDERING whether to plan a day outdoors, reader Chris Shaw went, as one does these days, to the BBC's weather website at www.bbc.co.uk/weather . He was a little alarmed to read that the outlook for the west of England and Scotland and the whole of Wales and Ireland included "sunny spells". The overnight outlook, that … Regulars