Everything you know is a lie.

BIG QUESTIONS
You can thank two Californian cardiologists from the 1950s.
Here's what the "play bow" really means.
And why do they have to be so loud?
According to the U.S. Flag Code, you shouldn’t let the flag touch the ground or hang it upside-down. While there’s no express prohibition about reversing the image, it’s probably a safe bet you shouldn’t do that, either.