Lucy climbed trees as well as walked

More evidence has emerged that Australopithecus afarensis - generally known as Lucy - lived at least partially in the trees.

Brain 'pacemaker' used to treat depression

A new way of stimulating the brains of people with depressive disorders  has been found to be effective in more than half of cases.

Facebook uses image-matching to remove child porn

Facebook is using image-matching software PhotoDNA to try and detect child pornography online.