◆ On this day

April 25

4 sourced moments from April 25 in history: A Rio Grande ambush gave Polk his Mexican-American War (1846); Construction of the Suez Canal officially began (1859); Franklin was an equal partner in the 1953 DNA double helix, plus 1 more.

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4 things happened on April 25

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1990 Space · Space Exploration

Hubble was deployed on April 25, 1990, with a flawed mirror

Discovery released Hubble on April 25, 1990; two months later NASA admitted its mirror was misshapen by a 1.3 mm testing error.

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1953 Human Body & Mind · Genetics

Franklin was an equal partner in the 1953 DNA double helix

Watson and Crick's 1953 paper shared a Nature issue with Rosalind Franklin's data, and a 2023 study of her notes calls her an equal partner, not a victim.

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1859 Technology · Engineering

Construction of the Suez Canal officially began

A single ceremonial pickaxe blow at a future port town began a decade of digging across the Egyptian desert.

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1846 History · War & Conflict

A Rio Grande ambush gave Polk his Mexican-American War

Mexican troops trapped 63 U.S. dragoons on April 25, 1846 — handing President Polk the pretext for a war message he had already drafted.

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