WBEZ brings you fact-based news and information. Sign up for our newsletters to stay up to date on the stories that matter.For the first time since the beginning of the pandemic, Amazon, Microsoft, Apple and Alphabet are each worth more than a trillion dollars according to their market capitalizations. While the virus continues to ravage the U.S. economy generally, the tech sector has remained a relative bright spot for now. Jessica Lessin of The Information explains. Also, many experts say there is a lack of adequate coronavirus testing measures in the U.S. NPR’s Rob Stein has the latest on problems with testing.