Clipped, not snipped American doctors are experimenting with ultrasound as a way of giving men a vasectomy in just a couple of minutes without making any incision, the British magazine New Scientist reported. The pioneering technique entails placing a plastic clip around a pinched fold of skin in the scrotum. In that fold are the vas deferens - the tubes that take sperm from the testicles into the urethra. Built into the clip is a plastic transducer that produces a 20- to 50-second, five-watt pulse of ultrasound, which penetrates the scrotum and heats cells in the wall of the vas deferens to 50 degrees Celsius. That destroys the cells, causing them to coagulate and block up the tubes permanently. 'You're essentially cooking the tissue,' Nathaniel Fried, a member of the team at Johns Hopkins Medical School in Baltimore, Maryland, told New Scientist. A glass a day Scientists have discovered how red wine cuts the risk of heart disease. Until now the answer to the French paradox - why a country renowned for its love of cheeses, rich sauces, foie gras and cigarettes has such a low rate of heart disease - has eluded scientists. They thought it was due to the French fondness of red wine, but couldn't explain why. Researchers led by Roger Corder of the William Harvey Research Institute at St Bartholomew's and the Royal London School of Medicine and Dentistry at the University of London found red wine is rich in polyphenols. These block the production of a protein linked to heart disease - the No 1 killer in many Western countries. 'We've shown that red wine extracts will inhibit the production of a peptide, which is a small protein, called endothelin,' Corder said. Endothelin causes blood vessels to constrict. Flake away Dandruff sufferers can do their hair a big favour by washing it in lukewarm rather than hot water, German health insurer HZK of Hamburg reports. Hot water irritates the skin which reacts by overproducing cells. These then die, forming the unsightly white dandruff particles. Hard water - which contains salts of calcium - also promotes dandruff. For best results, hair should be washed once or twice a week with lukewarm water using anti-dandruff shampoo.