The world's most powerful magnetic field and other news

BBC Click's LJ Rich looks at some of the week's best technology stories including:

  • Twitter is testing a soft blocking feature which removes followers without letting them know.

  • Two robots have been deployed in Singapore to discourage poor social behaviour.

  • MIT has turned on a massive high-temperature superconducting magnet called Sparc as part of its research into fusion power.

See more at Click's website and @BBCClick