On this day, a massive earthquake struck Huaxian in Shaanxi Province, China, leveling entire cities and triggering fires, floods, and landslides. Contemporary records claimed roughly 830,000 deaths, a toll that if accurate would make it the deadliest earthquake ever documented, illustrating the catastrophic vulnerability of densely populated river valleys to seismic disaster.

John Carroll, soon to become the first Catholic bishop in the United States, obtained the charter for Georgetown Academy on this day, founding what would grow into Georgetown University. It marked a milestone for Catholic education in a young nation still wary of the faith, and it would become one of the world's leading centers of diplomacy and international affairs training.

Elizabeth Blackwell received her medical degree from Geneva Medical College in upstate New York, becoming the first woman in America to do so. Rejected by more than a dozen schools before Geneva's students voted (partly as a joke) to admit her, she went on to found a hospital run by and for women, opening the medical profession to generations of female physicians.

North Korean naval vessels intercepted and boarded the USS Pueblo, a U.S. Navy intelligence-gathering ship, off the coast of Wonsan, killing crewman Duane Hodges and capturing the remaining 82 sailors. The crew endured brutal captivity and staged coded protests in propaganda photos before their release in December, and the ship itself remains in North Korean hands, displayed as a war trophy in Pyongyang to this day.

While President Milton Obote attended a Commonwealth summit in Singapore, army commander Idi Amin seized control of Uganda's government and radio stations in a swift, bloodless coup. Amin would rule for eight years marked by mass killings, expulsions, and economic collapse, transforming Uganda into a byword for post-colonial African tyranny before being ousted in 1979.

Voyager 2 flew within 81,500 kilometers of Uranus's cloud tops, the first and only spacecraft to visit the planet up close. It discovered ten new moons, two new rings, and a magnetic field bizarrely tilted 59 degrees from the planet's rotational axis, data that remains humanity's sole direct look at the solar system's seventh planet decades later.