(CNN) First, health officials said we shouldn't wear face masks. Now, many are saying we must wear masks if we want to protect the economy, reopen more schools and save tens of thousands of lives. But President Donald Trump said he won't consider a federal face mask mandate, citing outdated statements made several months ago. Why did health officials tell us not to wear masks before? What do doctors say about face masks now?

Source: CNN July 19, 2020 20:03 UTC