January 24

Following the assassination of Emperor Caligula, the Praetorian Guard proclaims his uncle Claudius as the new Roman emperor.

Following the assassination of the erratic and widely despised Caligula by his own guard officers, soldiers reportedly discovered his uncle Claudius hiding behind a curtain in the palace, fearing for his own life. Rather than killing him, the Praetorian Guard proclaimed Claudius emperor, largely because they wanted a family member of the imperial line who would owe them loyalty and reward their support.

King Henry VIII of England suffers a serious jousting injury that historians believe may have contributed to his later erratic behavior.

Henry VIII was thrown from his horse during a jousting tournament and reportedly lay unconscious for two hours, suffering a leg wound that never fully healed and worsened over the following years. Some historians theorize the resulting brain injury contributed to the dramatic personality changes, mood swings, and paranoia that marked the final years of his reign.

James W. Marshall discovers gold at Sutter's Mill in California, setting off the California Gold Rush.

Marshall, a carpenter building a sawmill for John Sutter, spotted flakes of gold in a river near Coloma, California, a discovery that initially he and Sutter tried to keep quiet. News leaked out anyway, and within a year, roughly 300,000 people from around the world had rushed to California, dramatically accelerating the territory's path to statehood and reshaping the American West.

British and German battlecruiser fleets clash at the Battle of Dogger Bank during World War I.

The naval battle in the North Sea saw British forces intercept and heavily damage a German battlecruiser squadron attempting a raid on English coastal towns, sinking one German ship. The engagement led Germany to become more cautious with its surface fleet for the remainder of World War I, shifting greater emphasis toward submarine warfare instead.

Franklin D. Roosevelt and Winston Churchill conclude the Casablanca Conference, agreeing to pursue the "unconditional surrender" of the Axis powers.

Meeting in Casablanca, Morocco, Roosevelt and Churchill finalized Allied strategy for the coming year, including plans to invade Sicily, while also working around the ongoing rivalry between French leaders Charles de Gaulle and Henri Giraud. The conference's unconditional surrender policy shaped Allied war aims for the conflict's remainder.

A B-52 bomber breaks apart over Goldsboro, North Carolina, accidentally dropping two hydrogen bombs that narrowly avoid detonating.

A B-52 carrying two hydrogen bombs broke apart in mid-air due to a structural failure, dropping both weapons near Goldsboro, North Carolina. Declassified documents later revealed that one bomb came dangerously close to detonating, with only a single safety switch preventing a catastrophic nuclear explosion, an incident that remained classified for decades.

Japanese soldier Shoichi Yokoi is found hiding in the jungles of Guam, having refused to surrender for 28 years after World War II.

Yokoi, a former Japanese soldier, had hidden in the jungles of Guam for nearly three decades after Japan's surrender, unaware or unwilling to believe the war had ended, surviving on local plants and fish. His discovery by local hunters made international headlines, and he was one of several Japanese holdouts found in remote Pacific locations years after World War II's conclusion.

NASA's Voyager 2 spacecraft makes its closest approach to Uranus, providing the first close-up images of the planet.

Voyager 2, launched in 1977 on a grand tour of the outer planets, became the only spacecraft ever to visit Uranus, revealing its tilted magnetic field, faint rings, and several new moons. The flyby remains, decades later, humanity's sole close-up encounter with the ice giant, since no dedicated follow-up mission has yet been sent.

The U.S. Department of Homeland Security formally begins operations.

Created in response to the September 11 terrorist attacks, the Department of Homeland Security consolidated 22 different federal agencies, including the Coast Guard, Secret Service, and immigration enforcement, into a single cabinet department focused on counterterrorism and domestic security. It represented the largest reorganization of the U.S. federal government since the creation of the Department of Defense.

Former USA Gymnastics doctor Larry Nassar is sentenced to up to 175 years in prison for sexual abuse.

Nassar's sentencing followed a week of harrowing victim impact statements from over 150 women and girls, many of them elite gymnasts, who described years of sexual abuse under the guise of medical treatment. The case exposed serious institutional failures at USA Gymnastics and Michigan State University and led to major reforms in athlete safeguarding policies across amateur sports.