A fire swept through the town of Chartres and its cathedral, destroying most of the earlier Romanesque structure but sparing the crypt and the venerated relic of the Virgin's tunic. Rather than despair, the townspeople and clergy took the relic's survival as a divine sign to rebuild grander than before. The reconstruction, completed remarkably fast over roughly 25 years, produced the High Gothic cathedral celebrated today for its stained glass and sculpture.

Summoned by Holy Roman Emperor Charles V to answer for his heretical writings, Luther was given a final chance to recant before the assembled imperial diet. He declared he could not act against Scripture or conscience, a stand traditionally summarized as 'Here I stand.' The refusal led to his excommunication and outlawry, but also cemented the Protestant Reformation's break from Rome.

Nearly elderly and reportedly carried on a litter, Opechancanough orchestrated one final large-scale assault against Virginia's expanding English colonies, echoing his surprise attack of 1622. Though the raid killed hundreds, the colony's growing population and militia strength meant it could not achieve the uprising's goal of driving the English from Virginia, and it instead triggered brutal retaliatory campaigns.

Alerted that British regulars planned to seize colonial military supplies and possibly arrest rebel leaders Samuel Adams and John Hancock, Boston's Sons of Liberty dispatched riders into the Massachusetts countryside. Revere's ride, later mythologized by Longfellow, helped rouse militia companies who would clash with British troops the next morning at Lexington, opening the American Revolutionary War.

Warned by signal lanterns hung in Boston's Old North Church, Revere and Dawes set off on horseback to alert Samuel Adams and John Hancock, and to rouse the countryside's minutemen. Revere was captured by a British patrol before reaching Concord, but other riders carried the alarm onward. The following morning's clashes at Lexington and Concord became the opening shots of the American Revolutionary War.

At 5:12 a.m., the San Andreas Fault ruptured along nearly 300 miles, sending violent shaking through San Francisco. Gas lines burst and ruptured water mains left firefighters helpless as flames consumed over 28,000 buildings. The disaster displaced half the city's population of 400,000 and reshaped American ideas about urban fire codes and seismic engineering.

Led by Lieutenant Colonel Jimmy Doolittle, sixteen B-25 bombers took off from the carrier USS Hornet in a mission considered nearly suicidal given the aircraft's limited range. The raid caused modest physical damage but delivered a profound psychological blow to Japan and boosted American morale after Pearl Harbor. Most crews crash-landed or bailed out over China, and several were captured and executed by Japanese forces.

Albert Einstein died at Princeton Hospital in the early hours of April 18, 1955, having requested cremation and no memorializing of his remains. Pathologist Thomas Harvey performed the autopsy and, without authorization, extracted and preserved Einstein's brain, later cutting it into more than 200 pieces sent to researchers worldwide. Studies conducted decades later reported unusual features in brain structure, though scientists remain divided on what, if anything, they reveal about intelligence.

Registered as 'K.V. Switzer,' the 20-year-old Syracuse University student ran alongside her boyfriend and coach. Race co-director Jock Semple chased her down mid-race, grabbing her jersey and shouting for her to get out, until Switzer's boyfriend shoved him aside. She finished the race in about four hours and 20 minutes, and the photographs of the confrontation became iconic images of the women's rights movement.

Communist Khmer Rouge troops marched into the Cambodian capital as government forces surrendered, ending five years of civil war. Initial cheers from war-weary residents quickly turned to horror as the new regime immediately began forcibly evacuating the city's roughly two million residents into the countryside. The takeover marked the start of Pol Pot's radical agrarian revolution, which led to the deaths of an estimated 1.5 to 2 million Cambodians through executions, starvation, and forced labor.