Growing inequality, environmental decline and "teetering" economies mean the world must change the way it does business, a major UN report says.

A dose of ultrasound can stop the production of sperm, according to researchers investigating a new form of contraception.

Measuring blood pressure in both arms should be routine, says a University of Exeter study, because it is the difference between the arms that counts.

The Little Ice Age began in the 1300s due to the cooling effect of massive volcanic eruptions, and was sustained by changes in Arctic ice cover, scientists conclude.

Scientists want the UK public to report their sightings of black squirrels, in order to estimate the rate at which they are spreading.