Mechanical engineer Michael Goldfarb, right, and Craig Hutto, the young amputee who has been testing the state-of-the-art prosthetic leg for the Vanderbilt engineers. A new lower-limb prosthetic developed at Vanderbilt University allows amputees to walk without the leg-dragging gait characteristic of conventional artificial legs.

A key glacier in Greenland is melting faster than previously expected, according to findings by a team of academics, including Dr Edward Hanna from University of Sheffield.

Researchers have uncovered exactly how a human egg captures an incoming sperm to begin the fertilisation process, in a new study published this week in the journal Science.