Traveling for more than four hours by air, bus, car or train puts people at risk for venous thrombosis. Dr Suzanne and her colleagues from Leiden University found that traveling in general, doubles the risk of venous thrombosis.

Venous thrombosis refers to a blood clot inside the vein obstructing its blood flow.

(AHN)-Experts warn that Blackberry email devices can be so addictive that owners may need to be weaned off them with treatment similar to that given to drug users.

The study, carried out by New Jersey's Rutgers University School, claims the Blackberry is fueling a rise in email and internet addiction, with sufferers able to survive only a few minutes without checking for new mail. The study finds the palmtop gadgets, which have been nicknamed "crackberries" because users quickly become hooked on them, could be seriously damaging to mental health.

The World Health Organization on Tuesday said it had found no evidence that the deadly H5N1 virus or bird flu is spreading among humans in a remote island in Java, Indonesia where two people died from the disease last week and a third person remains ill.

WHO investigators dismiss fears that the virus has already mutated to human-to-human transmission which could make the spread of the disease faster.

Johns Hopkins scientists are suggesting that children with serious untreated sleep apneas are prone to suffer damage to two structures in the brain, affecting learning ability; this would eventually end up lowering IQ levels in those children.

The Hopkins study was done using 19 children with severe obstructive sleep apnea or OSA and by comparing them to 12 who did not have the disorder.

The governments of China and Japan on Tuesday said the two countries will join forces in the fight against the dreaded bird flu and other infectious diseases through an exchange of information and studies. The joint effort of the neighboring countries is a significant leap despite strained political ties.

The heads of Japan's National Institute of Infectious Diseases and the Chinese Center for Disease Control and Prevention inked a pact to jointly conduct research on infectious disease and cooperate in looking for vaccines.