Breaking Down Day 1 of the Derek Chauvin Trial

Prosecution, defense offer competing causes of George Floyd's death. 

Prosecutor: Ex-officer Derek Chauvin "betrayed" his badge, used excessive and unreasonable force on George Floyd. 

Dispatcher: Called sergeant while watching video of Floyd arrest; felt "something wasn't right," was "voicing my concerns".  

Biden warns war against COVID-19 "far from won".

First real-world study finds Pfizer, Moderna vaccines 90% effective after two doses, 80% effective after one. 

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