September 25th is the 268th day of the year. There are 97 days left.

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Today's number is 25

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25 is 5 squared, and it has no other divisors. It is odd, like the square of every prime other than 2.

25 is the smallest square that is the sum of two smaller squares (9 & 16). Carpenters and others make fact of this property to draw large right angles, since this is a pythagorean triangle, with sides of 3, 4 and 5

25 is manganese
25 is the minimum age to get elected to the House of Representatives
I-25 connects Wyoming and New Mexico, but nobody is sure why

25, in Hindi, is Pachisi, the national board game of India. Ours in the US must be Monopoly, I guess.

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Title 25 of the US Code is INDIANS.

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25 BCE
was the Year of the Consulship of Augustus and Silanus.
This was the 9th consulship for Caesar Augustus)
The temple to Neptune was built on the Circus Flaminius. (There was no temple to Uranus.)
Rome surpassed Chang'an, China as the largest city in the world.

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25 CE
was the Year of the Consulship of Lentulus and Agrippa
Liu Xiu restored the Han dynasty in China, becoming Emperor Guangwu of Han.

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On this day in:
1066 -- King Harold whupped King Harald at The Battle of Stamford Bridge. Three Days later, William the Bastard walked ashore unopposed way down south in Pevensey Bay.
1513 -- Spanish explorer Vasco Nunez de Balboa (aka stout Cortez) reached the pacific
1789 -- Congress passed the Bill of Rights. Amendments 2, 3, 9 & 10 still survive
1846 -- Zachary Taylor captured Monterrey.
1890 -- Congress established Sequoia National Park.
1906 -- Leonardo Torres y Quevedo demonstrated the Telekino, a remote control device
1929 -- Jimmy Doolittle performed the first airplane flight using instruments only
1942 -- Swiss Police instructions dictated that refugees because of race alone were not "Political Refugees"
1944 -- Survivors of the British 1st Airborne pulled out of Arnhem
1956 -- The first transatlantic telephone cable was inaguarated
1957 -- Central High in Little Rock was integrated by force

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Born this day in:

1683 -- Jean-Philippe Rameau, composer, harmony freak
1764 -- Fletcher Christian, sailor
1862 -- Leon Boellmann, organist and composer
1897 -- William Faulkner, writer
1903 -- Mark Rothko, painter
1906 -- Dmitri Shostakovich, pianist and composer
1923 -- Sam Rivers, sax, clarinet, harmonica and piano player, also a composer
1929 -- Barbara Walters, journalist, producer and talking head
1930 -- Shel Silverstein, author, poet, illustrator and songwriter
1932 -- Glenn Gould, pianist and composer
1937 -- Mary Allen Wilkes, computer scientist and attorney
1942 -- John Taylor, pianist
1946 -- Jerry Penrod, bassist
1951 -- Burleigh Drummond, drummer (ambrosia)
1955 -- Steven Severin, bassist (souixie)
1964 -- Barbara Dennerlein, organist
1972 -- Douglas September, singer, songwriter and guitarist

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Died this day in:

1066 -- Harald Hardrada, king
1621 -- Mary Sidney, author and poet
1777 -- Johann Heinrich Lambert, mathematician, physicist, and astronomer
1849 -- Johann Strauss I, composer
1867 -- Oliver Loving, co-developer of the Goodnight-Loving Trail
1917 -- Thomas Ashe, Irish Republican Brotherhood member, founding member of the Irish Volunteers
1928 -- Richard F. Outcault, cartoonist
1933 -- Ring Lardner, journalist and author
1960 -- Emily Post, author, snoot, conformist, stickler, bluenose
1970 -- Erich Maria Remarque, author
1971 -- Hugo Black, jurist, constitutionalist and civil rights supporter
1980 -- John Bonham, drummer
1999 -- Marion Zimmer Bradley, author
2003 -- George Plimpton, writer and editor
2012 -- Andy Williams, singer
2013 -- Billy Mure, studio guitarist

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Holidays, Holy Days, Festivals, Feast Days and such:

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So, for music,
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William the Bastard

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Bill of Rights

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Jean-Philippe Rameau

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Leon Boellmann

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Dmitri Shostakovich

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Sam Rivers

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Shel Silverstein

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Glenn Gould

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John Taylor

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Jerry Penrod

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Burleigh Drummond

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Steven Severin

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Barbara Dennerlein

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Douglas September

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Johann Strauss I

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Goodnight - Loving Trail

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Thomas Ashe

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John Bonham

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Andy Williams

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Billy Mure

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Bonus:
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photo from internet archive via Flickr