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| ||1578 – William Harvey, English physician and academic (d. 1657) | | ||George Mohr - Jørgen Mohr (Latinised Georg(ius) Mohr; born 1 April 1640) was a Danish mathematician, known for being the first to prove the Mohr–Mascheroni theorem, which states that any geometric construction which can be done with compass and straightedge can also be done with compasses alone. |
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| ||1640 – Georg Mohr, Danish mathematician and academic (d. 1697) | | File:Sophie Germain.jpg|link=Sophie Germain (nonfiction)|1776: Mathematician, physicist, and philosopher [[Sophie Germain (nonfiction)|Sophie Germain]] born. Germain's work on Fermat's Last Theorem will provide a foundation for mathematicians exploring the subject for hundreds of years after. |
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| File:Sophie Germain.jpg|link=Sophie Germain (nonfiction)|1776: Mathematician, physicist, and philosopher [[Sophie Germain (nonfiction)|Sophie Germain]] born. Her work on Fermat's Last Theorem will a foundation for mathematicians exploring the subject for hundreds of years after. | | File:William James Sidis 1914.jpg|link=William James Sidis (nonfiction)|1898: Mathematician and anthropologist [[William James Sidis (nonfiction)|William James Sidis]] born. Sidis will become famous first for his precocity and later for his eccentricity and withdrawal from public life. |
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| ||Sir William Snow Harris (b. 1 April 1791) was an English physician and electrical researcher,[1] nicknamed Thunder-and-Lightning Harris,[2] and noted for his invention of a successful system of lightning conductors for ships. It took many years of campaigning, research and successful testing before the British Royal Navy changed to Harris's conductors from their previous less effective system. One of the successful test vessels was HMS Beagle which survived lightning strikes unharmed on her famous voyage with Charles Darwin. No pic (Beagle). | | File:Robin Farquharson.jpg|link=Robin Farquharson (nonfiction)|1973: Mathematician [[Robin Farquharson (nonfiction)|Robin Farquharson]] dies. Farquharson wrote an influential analysis of voting systems in his doctoral thesis, later published as ''Theory of Voting''. |
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| ||1826 – Samuel Morey received a patent for a compressionless "Gas or Vapor Engine". | | File:RFC 3514 IP EVIL INTENT.jpg|link=Evil bit (nonfiction)|2003: Steve Bellovin publishes Request for Comment 5314, subsequently known as the [[Evil bit (nonfiction)|evil bit]] protocol, a humorous April Fool's Day proposal. |
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| ||1865 – Richard Adolf Zsigmondy, Austrian-German chemist and academic, Nobel Prize laureate (d. 1929)
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| ||Martin Ohm (d. April 1, 1872, Berlin) was a German mathematician. He was the first to fully develop the theory of the exponential ab when both a and b are complex numbers in 1823. He is also often credited with introducing the name "golden section" (goldener Schnitt).
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| ||1874 – Ernest Barnes, English mathematician and theologian (d. 1953)
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| File:Mountain vendetta.jpg|link=Havelock|1890: [[Havelock]] survives shootout by shooting first.
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| File:Herman_Hollerith.jpg|link=Herman Hollerith (nonfiction)|1891: Inventor [[Herman Hollerith (nonfiction)|Herman Hollerith]] uses census data to locate [[Havelock]].
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| File:William James Sidis 1914.jpg|link=William James Sidis (nonfiction)|1898: Mathematician and anthropologist [[William James Sidis (nonfiction)|William James Sidis]] born. He will become famous first for his precocity and later for his eccentricity and withdrawal from public life.
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| ||Sophus Mads Jørgensen (d. 1 April 1914) was a Danish chemist. He is considered one of the founders of coordination chemistry. Pic.
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| ||1916 – Sheila May Edmonds, British mathematician (d. 2002)
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| File:Reddy Kilowatt US patent picture 1933.jpg|link=Reddy Kilowatt (nonfiction)|1933: [[Reddy Kilowatt (nonfiction)|Ready Kilowatt]] performs in off-Broadway adaption of ''[[Reddy Kilowatt Versus the Travelling Salesman Problem]]''.
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| ||1960 – The TIROS-1 satellite transmits the first television picture from space.
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| ||Lev Davidovich Landau (d. 1 April 1968) was a Soviet physicist who made fundamental contributions to many areas of theoretical physics.
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| ||Dame Kathleen Lonsdale, DBE, FRS (d. 1 April 1971) was a British crystallographer who proved, in 1929, that the benzene ring is flat by using X-ray diffraction methods to elucidate the structure of hexamethylbenzene. She was the first to use Fourier spectral methods while solving the structure of hexachlorobenzene in 1931.
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| File:Robin Farquharson.jpg|link=Robin Farquharson (nonfiction)|1973: Mathematician [[Robin Farquharson (nonfiction)|Robin Farquharson]] dies. He wrote an influential analysis of voting systems in his doctoral thesis, later published as ''Theory of Voting''.
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| ||1976 – Apple Inc. is formed by Steve Jobs, Steve Wozniak, and Ronald Wayne in Cupertino, California, USA.
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| File:Tan Lei.jpg|link=Tan Lei (nonfiction)|2016: Mathematician [[Tan Lei (nonfiction)|Tan Lei]] dies. She specialized in complex dynamics and functions of complex numbers, making contributions to the study of the Mandelbrot set and Julia set.
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| File:Cantor Parabola.jpg|link=Cantor Parabola|2018: Math photographer [[Cantor Parabola]] attends Minicon 53, taking a series of photographs with temporal superimpositions from Minicons 52 and 54.
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