A microscopic Mona Lisa from 'DNA origami' and other news

BBC Click's Lara Lewington looks at some of the best of the week's technology stories including:

  • A new chat app from Facebook for children under the age of 13

  • Nissan announced plans to launch robot taxis in Japan

  • The Mona Lisa has been recreated on a microscopic scale using a process called DNA origami

See more at Click's website and @BBCClick.