Summary: As the U.S. continues to grapple with the pandemic, vaccine supply remains limited in some areas. Distribution systems are fragmented and tough to navigate, especially for the estimated 25 million Americans who don't have internet access for online registration. Luckily, these volunteers are trying to fill that gap by helping strangers nab slots to get their shots. John Yang reports. PBS NewsHour is supported by - https://www.pbs.org/newshour/about/funders
