Harvard researchers develop a system to orientate small objects in any direction using magnetic levitation.

All children in England's state schools should get lessons about sex and relationships from the age of seven, the Liberal Democrats say.

The World Health Organization says there should be regulations preventing the use of electronic cigarettes indoors in public and work places.

The UK's head of counter-terrorism calls for help to identify people who have travelled to Syria or shown signs of being radicalised.

The last remaining population of the world's rarest bird, the Madagascar pochard, needs a new wetland home if it is to thrive again, a study reveals.

Amazon buys video-game streaming service Twitch for $970m (£585m), surprising many after rumours emerged earlier this year that Google's YouTube was in final stages to purchase the firm.

A new voluntary code of conduct for how police officers use their powers to stop and search members of the public is launched by the government.

The US was "caught off-guard" by air strikes on Libya reportedly carried out by the UAE with Egyptian help, a senior official tells the BBC.