Future tech

Pretty much all of the tech giants attend the vast Vegas expo - either to unveil new products or to clinch deals behind the scene. But in recent years it's been start-ups that have had many of the most eye-arresting and sensational reveals. There are more at this year's show than ever before, thanks in part to crowdfunding. They now have to convince retailers - hunting through the halls for the next bestsellers - that the promise of their concept videos has been delivered upon. Dozens of start-ups are also there thanks to help from governments and other national bodies - France, Israel, Ukraine and the Netherlands all have stands where they'll fly the flag for local talent.