The Zamboni machine, the tractor-like device used to refinish the surfaces of ice rinks, was invented by Frank Zamboni, an ice salesman who, thanks to the advent of compressor-based refrigeration, went into the ice rink business.

Although over a century and a half has elapsed since settlers traversed the Oregon Trail across the United States, you can still find patches of wagon ruts; the tens of thousands of wagons that passed over the trail left some areas permanently worn down, compacted, and inhospitable to vegetation.

There are no remaining descendants of the 16th U.S. President, Abraham Lincoln; his last descendant, great-grandson Robert Todd Lincoln Beckwith, died on December 24, 1985.