postle service is hiring entry level positions. amazon is adding to its workforce. grocery stores are also hiring. >>> more evidence tonight that the virus behind this global pandemic is spreading in an unusual manner. the cdc and the state of california are reviewing whether anyone out in public should wear a mask to prevent spreading germs. when it comes to covid-19, a new study published wednesday by the cdc suggests virus is behaving in a dangerous way. researchers in singapore found up to 10% of no covid infections are sparked by individuals who look healthy, but are actually carrying the bug. >> this is a concern. it hasn't been proven that that is an important way that the virus is transported, but a lot of the day that that we have collected now suggests that it very well may be. >> reporter: now federal and state health experts are reviewing whether anyone should live at least some face covering when out in public. >> the notion that everyone should wear a mask the way some people have? asian countries, for example, certainly becomes a strategy. >> reporter