November 13 is the 317th day of the year, there are 48 days left
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Today's number is 13

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13 is
13 is a prime number, it is the 6th prime

13 is also a prime if the digits are reversed (31)

13 is a pythagorean prime (13 = 3**2 + 4**2 & 13 = 4n+1 where n =3)

13 is a fibonacci number (0,1,1,2,3,5,8,13).

13 is the hypotenuse of a right traingle with sides of 5 & 12. 5, 12 & 13 can be used to test for right angles, like 3,4 & 5 can

There are 13 Archimedean Solids.

1/13 is the non-ending decimal 0.076923 with endless repetitions of 076923 thereafter

A deck of cards has 4 suits of 13 cards each.

The US was formed from 13 rebellious British Colonies

13 is also a Wilson Prime

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Title 13 of the US Code is CENSUS

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13 BCE
was the Year of the Consulship of Nero and Varus
Yep, that damn Varus again, Publius Quinctilius Varus. Ptui!

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13 CE
was the Year of the Consulship of Silius and Plancus
Strabo published a book on the shape of the Earth & Ovid published books 1-3 of his Epistulae ex Ponto.
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On this day in:

1887 – Bloody Sunday, the Army and police attacked protesters in London, who fought back
1918 – The Allies occupied Constantinople
1927 – The Holland Tunnel began carrying traffic
1940 – Fantasia was released
1956 – The Supremes struck down Alabama's laws requiring segregated buses
1966 – Israel launched an attack on the village of As-Samu
1982 – Boom-Boom Mancini beat Duk Koo Kim who soon after died
1982 – The Vietnam Veterans Memorial in Washington, D.C, was dedicated
2001 – GWB authorized military tribunals against foreigners suspected of links to terrorist acts or plans
2002 – Iraq agreed to the terms of UN Security Council Resolution 1441
2015 – Paris terror attacks

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Born this day in:

1699 – Jan Zach, violinist, organist, and composer
1715 – Dorothea Erxleben, Germany's first female PhD and first female MD
1814 – Joseph Hooker, general famous for camp followers
1850 – Robert Louis Stevenson, author and poet
1856 – Louis Brandeis, jurist
1869 – Helene Stocker, feminist, pacifist, and gender activist
1893 – Edward Adelbert Doisy, biochemist
1894 – Bennie Moten, pianist and bandleader
1921 – Joonas Kokkonen, pianist & composer
1934 – Jimmy Fontana, singer, songwriter, and actor
1939 – Idris Muhammad, drummer and composer
1940 – Baby Washington, singer
1942 – John P. Hammond, singer, songwriter and guitarist
1944 – Timmy Thomas, singer, songwriter, and keyboard player
1945 – Bobby Manuel, guitarist and producer
1945 – Knut Riisnaes, saxophonist, flautist and composer
1947 – Toy Caldwell, guitarist and songwriter
1947 – Amory Lovins, physicist and environmentalist
1949 – Terry Reid, singer, songwriter and guitarist
1957 – Roger Ingram, trumpet player
1969 – Josh Mancell, drummer and composer
1973 – Ari Hoenig, drummer and composer
1978 – Nikolai Fraiture, bassist

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Died this day in:

1460 – Prince Henry the Navigator,
1903 – Camille Pissarro, painter
1955 – Bernard DeVoto, historian
1974 – Karen Silkwood, activist
1996 – Bill Doggett, pianist and composer
2004 – John Balance, singer and songwriter
2016 – Leon Russell, musician, singer, songwriter, mad dog, wrecking crew

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Holidays, Holy Days, Festivals, Feast Days and such:
World Kindness Day
Sadie Hawkins Day (US Only)

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So, for music,
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Fantasia

Boom Boom Mancini

Jan Zach

Joseph Hooker

Bennie Moten

Joonas Kokkonen

Jimmy Fontana

Idris Muhammad

Baby Washington

John P. Hammond

Bobby Manuel

Knut Riisnaes

Toy Caldwell

Terry Reid

Roger Ingram

Josh Mancell

Ari Hoenig

Nikolai Fraiture

Bill Doggett

John Balance

Leon Russell

Bonus:
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Bill Doggett

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Leon Russell music

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picture is National Kindness Day, public domain, by Daniel Lobo