Magellan mapped 98% of Venus's surface with radar — revealing a world covered in lava plains and volcanic features.
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Light travels at approximately 299,792,458 meters per second in a vacuum.
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The last guillotine execution happened in 1977.
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Harriet Tubman never lost a single passenger on the Underground Railroad — she made 19 missions and freed approximately 70 enslaved people.
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The development of MRI technology improved internal imaging.
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The world's longest cave system, Mammoth Cave in Kentucky, has over 660 km of mapped passages.
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More than 80% of the world's oceans remain unmapped and unexplored.
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The first computer bug was an actual bug — a moth found trapped in a Harvard Mark II relay in 1947.
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