66K views · 566 reactions | Watch on NewsHour: President Trump invokes new powers to combat the coronavirus pandemic | PBS NewsHour | Facebook

Newsrooms across the country, including PBS News, rely on the Associated Press on election night. @LisaDNews walks through how the AP makes calls on this major voting day, from calculating the "expected vote" to conducting voter surveys. Here are a few key terms to know. | PBS NewsHour

45K views · 915 reactions | The first COVID-19 vaccines represent an incredible record-breaking achievement in vaccine development. Not only were the Moderna and Pfizer/BioNTech vaccines created in record time, they also harness a never-before-used technology: immunization through mRNA. But how do these vaccines protect us and how do they differ from other vaccines? These first mRNA vaccines may pave the way for faster, more efficient vaccine development in the future. | PBS NewsHour | Facebook