Rory Cellan-Jones visits Virgin Hyperloop One's test track near Las Vegas.
Tech correspondent Rory Cellan-Jones picks his highlights and lowlights from the Vegas tech show.
Tech firms try to convince the public their robots are ready to buy despite several stumbles.
An over-the-air recharging solution designed for use in the car is on show at the CES trade fair.
A smattering of gadgets show off at the tech show promise better battery life than we're used to.