How the Revolving Door Was Born Out of Awkward Encounters
Imagine arriving at a door the same time as another stranger. You’re both trying to be polite and neither of you wants to enter first, but you can’t seem to agree who’ll open the door. Enter Theophilus Van Kannel. A hatred of awkward encounters led the American inventor to create the world’s first revolving door. If you like this video, like us on facebook and twitter.