Chemists isolate the pleasantly perfumed active chemicals in sweetgrass - a plant used by Native Americans to fend off mosquitoes.

Researchers at Glasgow University develop a new way to protect farmed salmon from sea lice.

Evidence from a variety of sources suggests that the first people to resettle Britain after the Ice Age were more sophisticated than we could have imagined.

The World Health Organization is calling for "intensified action" to protect health workers treating people in crisis and conflict zones.

New lab results show how collisions between comets and planets can make the molecules that are the essential building blocks of life.

Confusion over the types of coal being burned in Chinese power stations means the country's carbon emissions have been overestimated.

A new probe sticks to blood clots so they "light up" in a PET scan, and could eventually save time during treatment of stroke and related conditions.

Software that helps Prof Stephen Hawking to speak via a computer has been published online by Intel, the company that created it.