Potential COVID-19 vaccines are kept in a tray at Novavax labs in Maryland on March 20. The Novavax vaccine requires an immune-boosting ingredient called an adjuvant to be effective.
Andrew Caballero-Reynolds/AFP via Getty Images
U.S. Customs and Border Protection is testing mobile surveillance towers like this one, parked at the Border Security Expo in San Antonio, to improve the tracking of illegal crossers. Critics of the border wall say the government should favor virtual technology over steel and concrete.
In a ruling Monday, a California judge said Lyft and Uber have refused to comply with a California law, known as AB5, passed last year that was supposed to make it harder for companies in the state to hire workers as contractors.
Robyn Beck/AFP via Getty Images