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2. English Braille - Wikipedia

   en.wikipedia.org/wiki/English_Braille

   Without proper rendering support, you may see question marks, boxes, or other symbols instead of Braille characters. English Braille, also known as Grade 2 Braille, [1] is the braille alphabet used for English. It consists of around 250 letters ( phonograms ), numerals, punctuation, formatting marks, contractions, and abbreviations ( logograms ).

3. Subtraction - Wikipedia

   en.wikipedia.org/wiki/Subtraction

   Subtraction is an operation that represents removal of objects from a collection. [1] For example, in the adjacent picture, there are 5 − 2 peaches—meaning 5 peaches with 2 taken away, resulting in a total of 3 peaches. Therefore, the difference of 5 and 2 is 3; that is, 5 − 2 = 3.

4. List of numeral systems - Wikipedia

   en.wikipedia.org/wiki/List_of_numeral_systems

   The smallest base greater than binary such that no three-digit narcissistic number exists. 80: Octogesimal: Used as a sub-base in Supyire. 85: Ascii85 encoding. This is the minimum number of characters needed to encode a 32 bit number into 5 printable characters in a process similar to MIME-64 encoding, since 85 5 is only slightly bigger than 2 ...

5. Trachtenberg system - Wikipedia

   en.wikipedia.org/wiki/Trachtenberg_system

   Trachtenberg system. The Trachtenberg system is a system of rapid mental calculation. The system consists of a number of readily memorized operations that allow one to perform arithmetic computations very quickly. It was developed by the Russian engineer Jakow Trachtenberg in order to keep his mind occupied while being in a Nazi concentration ...

6. List of prime numbers - Wikipedia

   en.wikipedia.org/wiki/List_of_prime_numbers

   Prime Numbers List Full list for prime numbers below 10,000,000,000, partial list for up to 400 digits. Interface to a list of the first 98 million primes (primes less than 2,000,000,000) Weisstein, Eric W. "Prime Number Sequences". MathWorld. Selected prime related sequences in OEIS.

7. Why the stock market is suddenly freaking out - AOL

   www.aol.com/why-stock-market-suddenly-freaking...

   The bad jobs report sent stocks sinking even further: The Dow fell 800 points, or 2.3%. S&P 500 futures were down 2.6% and Nasdaq futures were 3.1% lower. It’s been a turbulent few weeks for ...