In our news wrap Friday, worldwide deaths from COVID-19 neared 400,000, with more than quarter of those occurring in the U.S. The World Health Organization called for widespread use of face masks amid "evolving evidence" they can help reduce transmission. Also, an Associated Press count shows former Vice President Joe Biden within 18 delegates of clinching the Democratic presidential nomination. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders