Good morning, it's Friday, August 21st. I’m Lynn Norris and here are the Five Things You Must Know Before the Market Opens, presented by The Street: No insert First up, Stock Futures Point to a Weaker Wall Street Open Stock futures slipped Friday as worries over a global economic recovery overshadowed positive developments on a coronavirus vaccine. Contracts linked to the Dow Jones Industrial Average fell 29 points, S&P 500 futures declined 5 points and Nasdaq futures were down 11 points.