Template:Selected anniversaries/April 25
1599: Oliver Cromwell born. He will become a military and political leader and later Lord Protector of the Commonwealth of England, Scotland, and Ireland.
2001: Army research laboratories convert modern plowshares into ancient swords. Military contractors call technique "Astonishing breakthrough."
2010: Egg Tooth Neighborhood Association organizes benefit for victims of crimes against mathematical constants.
1849 – Felix Klein, German mathematician and academic (d. 1925)
1874 – Guglielmo Marconi, Italian businessman and inventor, developed Marconi's law, Nobel Prize laureate (d. 1937)
1903 – Andrey Kolmogorov, Russian mathematician and academic (d. 1987)
1744 – Anders Celsius, Swedish astronomer, physicist, and mathematician (b. 1701)
1840 – Siméon Denis Poisson, French mathematician and physicist (b. 1781)
1792 – Highwayman Nicolas J. Pelletier becomes the first person executed by guillotine.
1953 – Francis Crick and James Watson publish "Molecular Structure of Nucleic Acids: A Structure for Deoxyribose Nucleic Acid" describing the double helix structure of DNA.
1954 – The first practical solar cell is publicly demonstrated by Bell Telephone Laboratories.
1960 – The United States Navy submarine USS Triton completes the first submerged circumnavigation of the globe.
1961 – Robert Noyce is granted a patent for an integrated circuit.
1983 – Pioneer 10 travels beyond Pluto's orbit.