First look at coolest tech of CES 2018

About 4,000 companies - many of them start-ups - are arriving in town this weekend. Over the coming days, they will reveal new products, secure orders and hopefully provide a taste of the future at the trade fair. The event has its roots in consumer gadgets, but now sprawls into fields including artificial intelligence, automobiles, medicine, marketing and even agriculture. Most of the big technology brands in attendance will have something new to brag about. But increasingly, they hold flagship products back for stand-alone events.