On this day in 1966, NASA's lunar lander Surveyor 1 landed on the moon, marking the first time an American space probe made a successful soft-landing on the lunar surface.

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On this day in 1974, the Heimlich Maneuver was unveiled in an article in the Journal of Emergency Medicine.

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On this day in 1578, the Roman catacombs were rediscovered by accident.

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On this day in 1967, the Republic of Biafra declared its independence from Nigeria.

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On this day in 1453, Constantinople was captured by the Ottoman Empire, marking the end of the Byzantine Empire.

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On this day in 1831, abolitionist and religious leader Eliza Ann Gardner was born in New York.

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On this day in 1930, the Chrysler Building in Manhattan was completed.

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On this day in 1897, the novel "Dracula" was published.

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On this day in 1925, Mexican writer Rosario Castellanos was born.

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On this day in 1940, a group of Stalinist agents attempted to assassinate Leon Trotsky. Less than three months later, another Stalinist agent killed Trotsky.

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