Thomas Jefferson invented Swivel Chairs!
That's right, that office staple of today was invented by the US's third president. Jefferson bought an English-style Windsor chair (the ones where the legs and the back are put into drilled holes) from a Philadelphia cabinet maker. He then modified it so that the top and bottom parts were connected by a central iron spindle. And thus the first swivel chair was born.
It is said that his modified Windsor was the chair that he used when he drafted the Declaration of Independence in 1776. He would later send it to his plantation in Virginia, and the chair was later given to the American Philosophical Society.