US President Joe Biden and Chinese President Xi Jinping have held a 90-minute telephone conversation, discussing the need to try to avoid their rivalry veering into conflict. The Biden administration has yet to establish a trade policy with China. Despite worsening diplomatic tensions, bilateral trade has boomed this year, partly due to the pandemic. Plus, Facebook teams up with Ray-Ban to launch "smart glasses" that let wearers listen to music, take photos and videos and share them online.