Moritz, Switzerland, by wealthy tourists from Victorian Britain who were staying at the Palace Hotel owned by Caspar Badrutt. The early sleds were adapted from boys' delivery sleds and toboggans. These eventually evolved into bobsleighs, luges and skeletons.

On May 30, 1922, President Warren G. Harding becomes the first president to have his voice transmitted by radio while addressing a crowd at the dedication of the Lincoln Memorial. The broadcast heralded a revolutionary shift in how presidents addressed the American public. It was not until three years later, however, that a president would deliver a radio-specific address. That honor went to President Calvin Coolidge.

TIL the flat, round bread Americans know as 'English Muffins' don't come from England and were invented in New York City in the late 1800s. Their inventor, Samuel Bath Thomas, originally them called toaster crumpets.

Your teeth contain the hardest substance in the human body — your enamel. Bones aren't quite as hard as enamel, but they rank closely on the hardness scale. Other parts of your body (like muscles, ligaments, and tendons) are incredibly strong, but don't come close to the mineral-based tissue in your teeth and bones.