Category Archives: Mathematics

Feb 10 2017
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Mathematics

Fact #1292: There are prime numbers that are illegal to possess or distribute. One of the first ones, found in 2001, was used to bypass copyright protection on DVDs.

Source: https://en.wikipedia.org/wiki/Illegal_prime

Mar 04 2016
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Mathematics, Places

Fact #1051: Israeli schools do not use a ‘+’ sign in mathematics because if its resemblance to the Christian cross, instead using an inverted ‘T’ sign.

Source: https://en.wikipedia.org/wiki/Plus_and_minus_signs#Alternative_plus_sign

Nov 18 2015
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Mathematics

Fact #980: “Eleven Plus Two” is an anagram of “Twelve Plus One.”

Aug 06 2015
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History, Mathematics

Fact #906: In the Roman Empire, daytime was divided into 12 hours between sunrise and sunset, meaning that the length of hours changed with the seasons.

 

Jul 13 2015
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Mathematics

Fact #898: If you write any number between 1 and 99 as a word (in English), count the number of letters, write this new number as a word, and so on, you’ll end with number 4.

Source: Try it! http://blog.matthen.com/post/8554780863/pick-a-number-between-1-and-99-write-it-as-a

May 15 2015
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Language, Mathematics

Fact #859: One knot is a unit of speed equal to one nautical mile per hour, or 1.852 kmh or 1.151 mph.

The term derives from counting the number of knots in the line that unspooled from the reel of a ship log in a specific time, the original way to measure speed of a vessel through water.

 

Nov 13 2014
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Mathematics

Fact #725: The number 1,000,000,000,000,066,600,000,000,000,001 is a prime number. It’s called Belphegor’s prime.

Source: http://en.wikipedia.org/wiki/Belphegor%27s_prime

Oct 15 2014
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Entertainment, Mathematics

Fact #704: A standard 3×3 Rubik’s Cube has over 43 quintillion different positions.

Source: http://en.wikipedia.org/wiki/Rubik’s_Cube#Permutations

Oct 09 2014
Mathematics

Fact #700: The “half-your-age-plus-seven” rule for dating has existed since at least 1901.

Source: http://en.wikipedia.org/wiki/Age_disparity_in_sexual_relationships#The_.22half-your-age-plus-seven.22_rule

Jun 16 2014
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Entertainment, Mathematics

Fact #618: On an 8×8 chessboard, there are 26,534,728,821,064 ways for a knight to visit every square once and end up back at the square it started from.

Source: http://en.wikipedia.org/wiki/Knight%27s_tour#Number_of_tours

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