The latest developments in scientific endeavour. Cot death claims the lives of around 400 babies each year in the UK alone. Several factors have been suggested, such as the position a baby sleeps in, but, by and large, the cause of cot death remains a mystery. Scientists in the US, however, believe the answer may lie in a faulty mechanism in the baby's brain that fails to deliver enough oxygen to the child when supplies run low. Producer Rami Tzabar E-MAIL: scirad@bbc.co.uk