US entrepreneur Elon Musk has outlined his vision for a tunnel network under Los Angeles and shown how it might work.
Mr Musk also told the Ted (Technology, Entertainment and Design) conference he planned fully autonomous journeys across the US by the end of the year.
He spoke about how he wanted solar-powered roof tiles to be standard on "every home" within 50 years.
Fitbit has said it is investigating a report from a Wisconsin woman who said she suffered second-degree burns when her fitness tracker caught fire.
Dina Mitchelltold ABC Newsthat the Flex 2 began to combust on her wrist while she was reading a book.
Top US communications regulator Ajit Pai has proposed reversing net neutrality rules for internet service providers.
The Obama-era measures prohibit broadband providers from giving or selling access to certain internet services over others.
Those who fought to get the rules passed said his proposal would set off a fierce political battle.
Mr Pai announced the plan to roll back net neutrality measures in Washington.
An MP has urged Facebook to tackle fake news in the run-up to the UK's general election on 8 June.
Conservative MP Damian Collins expressed his concernsto the Guardian newspaper, saying fake news threatened "the integrity of democracy".
A parliamentary inquiry examining the "growin g phenomenon of fake news" waslaunched by Mr Collins in January.
