According to new White House guidelines, a state, city, or county has to show a decreasing rate of confirmed coronavirus cases for 14 days before reopening their economy. A year may seem like a long time to develop a vaccine for the coronavirus, but vaccine development typically takes longer. NPR's Joe Palca explains why it's so hard and what researchers are doing to speed things up.Food banks around the country have been stretched, including one in San Antonio. Last week it served 10,000 families, many of whom are dealing with joblessness and food insecurity caused by the pandemic. Plus, the man who developed the N95 mask filter technology comes out of retirement.Find and support your local public radio stationSign up for 'The New Normal' newsletterThis episode was recorded and published as part of this podcast's former 'Coronavirus Daily' format.