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Toxic chemicals from past decades could be hindering the recovery of Britain’s urban rivers, concludes a recent study by scientists from Cardiff University, the University of Exeter, and the Centre for Ecology and Hydrology.

A volcano will not send out an official invitation when it’s ready to erupt, but a team of researchers suggest that scientists who listen and watch carefully may be able to pick up signs that an eruption is about to happen.

When Jason Gulley steps off the plane Thursday in Ilulissat, Greenland, he’ll be packing rubber waders along with his down parka and cold-weather sleeping bag. 

Hip fractures are a major cause of death and disability among older people worldwide, with 70,000 cases every year in the UK, which cost the NHS around £2 billion.

Earth didn’t always harbor life. But around 4 billion years ago, something in the environment changed, and systems with biological properties began to emerge.