Most of us share 2-4% of DNA with Neanderthals; some have genes from Denisovans; but their genetic mark has vanished in some stretches of genetic code.

Physicists studying the motion of sperm discover that the little swimmers flock together in tight groups if the surrounding fluid is "viscoelastic".

A very hungry caterpillar that devours box plants - a staple of formal English gardens - is named "top pest" of 2015 by the UK's Royal Horticultural Society.

Ben Nevis, Britain's tallest mountain, is re-measured by Ordnance Survey and is now officially put at 1,345m high - a metre taller than before.