History Facts That Hurt Our Heads

List Rules
Vote up all the history facts that give you a 'knowledge headache.'

We all love picking up and collecting random historical facts: Miscellaneous bits of trivia that we hold onto give us a broader perspective on life, enhance our conversations, and make us see the world differently. All the exciting pieces and details of history have the potential to expand our awareness and deepen our understanding of the past, yet some are so bizarre they reshape our notions of time, space, and how they relate to one another.

Whether they completely rewired how our brains think of historical timelines, reshaped our ideas of intellectual evolution in ancient societies, or proved it is possible to attend multiple "once-in-a-lifetime" events, these 12 history facts seriously hurt our heads. 


  • Eratosthenes Calculated The Shape And Size Of The Earth More Than 2,000 Years Ago
    Photo: Bernardo Strozzi / Wikimedia Commons / Public domain

    Eratosthenes was an ancient Greek polymath: a scholar who excelled in math, geography, astronomy, philosophy, poetry, and music. Around 245 BCE, he was working as a librarian in the famed Library of Alexandria in Egypt when he came across a surprising annual event. When the scholar read about a well in Syene (modern-day Aswan) that cast no shadow for a moment in time every summer solstice, Eratosthenes devised a plan that allowed him to use the rare event to calculate the shape and size of Earth.

    By sticking a pole in a local well when the sun aligned with the structure, he found that while the well didn't create a shadow, the pole did. From there, the young scholar used basic algebra to determine Earth was both round and about 40,000 kilometers in circumference.

    Eratosthenes was astonishingly accurate: Modern technology estimates Earth is 40,008 kilometers from pole to pole!

    1,117 votes
  • Though the 13th Amendment constitutionally abolished slavery in the United States in December 1865, it only passed among three-fourths of the states. Mississippi voted against the amendment at the time, arguing enslavers had not yet received financial compensation for their loss of human property. Astonishingly, the problem wasn't resolved when the state finally voted to ratify the amendment in 1995, as lawmakers neglected to inform the US archivist.

    The oversight came to light only after a curious Mississippi resident - inspired by Steven Spielberg's movie Lincoln - began researching the state's postbellum history in 2013. After finding the bill was never submitted, he contacted the Mississippi secretary of state, and the amendment was finally ratified on February 7, 2013.

    845 votes
  • Both the Tyrannosaurus rex and stegosaurus roamed North America, but did so during two completely different time periods. While the stegosaurus trekked the continent during the late Jurassic Period over 150 million years ago, the T. rex didn't dominate the land until the late Cretaceous Period, which ended roughly 66 million years ago.

    So the two well-known dinosaurs, often categorized into the same era of prehistoric history, actually lived about 83 million years apart. Since mammals evolved 66 million years ago, the T. rex actually existed closer in time to humans than to the stegosaurus. 

    764 votes
  • Canada and the United States have a surprising history of stifled hostility. Major territorial disputes between the two countries date back to the War of 1812, when President Thomas Jefferson believed American troops could easily take over Canadian forts along the country's ill-defined borders. The attempts to conquer the Canadian borderlands ended up being unsuccessful, and ultimately, the conflict came to a close.

    Tensions mounted again in 1839 when the state of Maine sent a voluntary militia into Canada to stop their lumberjacks from cutting down trees along the border. Though no shots were fired and the conflict ended peacefully, the US had sent 50,000 men and $10 million to aid Maine's pursuits.

    While Americans brought about most of the skirmishes and plans for territorial domination, Canada flipped the script in 1921 by formulating a strategy to invade the US. Inspired by the tensions between the US and Great Britain over wartime debt, Canadian Lieutenant Colonel James Brown drew up a secret plan to overrun major cities among the Canadian-American border.

    Taking the imagined invasion seriously, Brown even sent spies into New England towns and devised a method for sneak attacks on weakened infrastructures like railroads and bridges. But ultimately, the plan never came to pass.

    592 votes
  • The Civil War Started At Wilmer McLean's First Home And Ended At His Second Home Over 100 Miles Away
    Photo: The Major & Knapp Eng. Mfg. & Lith. Co. 71 Broadway / Wikimedia Commons / Public domain
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    601 VOTES

    The Civil War Started At Wilmer McLean's First Home And Ended At His Second Home Over 100 Miles Away

    The Confederate Army used Wilmer McLean's Virginia family home as their headquarters during the First Battle of Bull Run in July 1861. After the home suffered significant damage from Union Army shells, McLean was determined to keep his family as far away from the conflict as possible. He chose a location over 100 miles south, where he continued his occupation as a wholesale grocer and supplier of sugar for the Confederate forces.

    Still, his efforts proved futile. On April 9, 1965, General Robert E. Lee surrendered to the Union Army in the front parlor of McLean's new home in Appomattox. This huge coincidence placed McLean and his family home at the beginning and end of the Civil War, despite his attempt to escape it.

    601 votes
  • Almon F. Rockwell's newly resurfaced journals provide his eyewitness accounts of the demise of Abraham Lincoln and James Garfield. The Civil War Army lieutenant colonel and longtime friend of Garfield was also a licensed physician. Rockwell was called to Lincoln's bedside the night the president was shot at Ford's Theatre and didn't leave until Lincoln's cadaver was escorted to the White House the next day.

    Sixteen years later, President Garfield appointed his close friend Rockwell as superintendent of  public buildings in Washington, DC, after his election in 1880. Among his other duties, the position required the lieutenant colonel to be close to the presidential family during public appearances.

    Rockwell not only attended to Garfield moments after he was shot at the Baltimore and Potomac Railroad Station in 1888, but he also stayed by his friend's side until his passing 79 days later. He is the only person to witness the demise of two American presidents. 

    436 votes