A reward chemical in the brain helps keep sleep-deprived people awake.

Survivors of the 1918 Spanish flu pandemic still make antibodies against the virus, revealing a long-lived immunity previously thought impossible.

Advances in gene therapy could tempt some athletes to enhance their genetic makeup, leading some researchers to work on detection methods just in case.

Just one change in a strain of avian flu virus makes it transmissible by direct contact in ferrets, but the virus still lacks the ability to spread by airborne particles.

Injected RNA molecule lowers LDL in rats and monkeys.

Players run a simulation of a throw in their own brains and muscles and are more accurate at predicting whether a shot will go in the basket than coaches, sports journalists or novice watchers.

New study shows synthetic musks are passed on to babies through mother’s milk, but how these artificial compounds act in the body still unclear.

Delivering small interfering RNAs, or siRNAs, to human immune cells in mice protects the cells from HIV and suggests future therapy for patients.

Separate neurons in the nematode brain control eating and fat-building. The discovery may help explain some mysteries of obesity.

Misfolded, clumping proteins evade conviction, but they remain prime suspects in neurodegenerative diseases.

A large, long-term study of sleep apnea links the breathing disorder to increased risk of death.

Sleep loss impairs fruit flies’ ability to learn, just as it does in people. But boosting dopamine in the flies can erase these learning deficits.

Halted in trials, an anti-HIV gel is ineffective, but may not add to risk of infection, as previously thought.