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  April 25
1744: Swedish astronomer
Anders Celsius,
after whom the temperature scale is named, died. 1792: The
guillotine was first used in France to execute highwayman Nicolas J. Pelletier.
1840: Siméon-Denis Poisson, mathematician and experimenter in electromagnetic theory,
died. 1849: Felix
Klein, mathematician and creator of the single-surfaced Klein bottle, was born.
1859: Ground was broken for the
Suez Canal.
1874: Radio pioneer
Guglielmo
Marconi was born in Bologna, Italy. 1900: Austrian-Swiss Nobel physicist
Wolfgang Pauli, of Exclusion Principal fame, was born. 1901: New
York became the first state to require automobile license plates - the fee was $1.
1927: Dudley
Allen Buck, inventor of the cryotron switch and ferroelectric RAM, was born.
1928: Floyd
Bennett, who piloted the airplane that flew Admiral Byrd, died. 1953: Dr. James
D. Watson and Dr. Francis H.C. Crick suggested the double helix structure of
DNA. 1961: Robert Noyce was granted a patent for the
integrated circuit. 1990: The
Hubble Space Telescope was deployed.
Note: These
historical tidbits (see daily
list) have been collected from various sources, mostly on the Internet.
As detailed in my
It Happened When? Factoid article, there
is a lot of wrong information that is repeated hundreds of times because most websites
do not validate with authoritative sources. On RF Cafe, events with
hyperlinks have been verified. Many years ago,
I began commemorating the birthdays of notable people and events with
special RF Cafe logos.
Where available, I like to use images from postage stamps from the country where
the person or event occurred. Images used in the logos are often from open source
websites like Wikipedia, and are specifically credited with a hyperlink back to
the source where possible.
Fair Use laws permit
small samples of copyrighted content.
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