Emma Coronel, the wife of Mexican drug lord Joaquin Chapo Guzman, is arrested in Virginia; lawmakers grilled HHS nominee Xavier Becerra and Capitol Hill police in separate congressional hearings; a new study found that one dose of the Pfizer vaccine can reduce the risk of contracting covid-19; and an Argentinian engineer was part of Nasa’s team that designed the Rover Perseverance’s supersonic parachute.