What we know about the AstraZeneca vaccine. And, the fractured relationship between Google and historically Black colleges and universities. Read more:Science reporter Carolyn Y. Johnson breaks down the results of the U.S. trial for the AstraZeneca covid-19 vaccine — and its challenges.Google’s failing approach to recruiting historically Black schools helps explain why there are few Black engineers in Big Tech. Reporter Nitasha Tiku says the pipeline for recruiting Black technical talent needs to be reexamined.