Traveling by air can be bewildering. Why do flight attendants ask passengers to open my window shades during takeoff and landing? Why is the airplane shaking with turbulence, and is it dangerous? How do airport workers fit all of people’s suitcases in the luggage hold? And what on earth are those airport runway numbers painted on the tarmac?
Educational and hilarious YouTube channel CGP Grey answers that last question in a recently posted 17-minute video that people allergic to science should probably not attempt to watch.