| For the first several thousand years of their existence, doors were largely knob-free; they were typically opened and closed using latches, handles, bars, or leather straps. The process of entering and exiting a room was revolutionized on December 10, 1878, when a self-taught 16-year-old inventor named Osbourn Dorsey received a patent for a doorknob with an internal door-latching mechanism. This was a massive improvement to existing doorknobs, which lacked internal latches and were generally more difficult to use — some used external bolts or strings and didn't stay in place as well. However, as modern innovations can take a while to catch on, it took several more years for most people to embrace Dorsey's upgraded doorknobs and begin having them installed in their homes. Although most of us now use Dorsey's version of a doorknob every day, little else is known about the African American inventor's life beyond the fact that his mother Christina and siblings Mary and Levi were enslaved prior to his birth in 1862. Before his inventing days, Dorsey either trained or worked as a blacksmith. | 
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