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2. Scott Flansburg - Wikipedia

   en.wikipedia.org/wiki/Scott_Flansburg

   Scott Flansburg (born December 28, 1963) is an American dubbed "The Human Calculator" and listed in the Guinness Book of World Records for speed of mental calculation. He is the annual host and ambassador for The National Counting Bee, a math educator, and media personality. He has published the books Math Magic and Math Magic for Your Kids.

3. Stepped reckoner - Wikipedia

   en.wikipedia.org/wiki/Stepped_reckoner

   The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz (started in 1673, when he presented a wooden model to the Royal Society of London [2] and completed in 1694). [1] The name comes from the translation of the German term for its operating mechanism, Staffelwalze ...

4. Reverse telephone directory - Wikipedia

   en.wikipedia.org/wiki/Reverse_telephone_directory

   A reverse telephone directory (also known as a gray pages directory, criss-cross directory or reverse phone lookup) is a collection of telephone numbers and associated customer details. However, unlike a standard telephone directory, where the user uses customer's details (such as name and address) in order to retrieve the telephone number of ...

5. Everything you need to know about credit utilization ratio - AOL

   www.aol.com/finance/everything-know-credit...

   There’s one more benefit to opening a balance transfer credit card: When you take out a new line of credit, you increase the amount of credit under your name. This can help you lower your credit ...

6. 52 Incredibly Cool Things That Are Free Online That Everyone ...

   www.aol.com/52-helpful-things-free-everyone...

   Image credits: agentp2319 #5. I built [qrfa.st](https://qrfa.st) which offers free qr codes. I built it because I heard horror stories about people making qr codes, only to find out later they had ...

7. Arithmometer - Wikipedia

   en.wikipedia.org/wiki/Arithmometer

   Arithmometer. The arithmometer (French: arithmomètre) was the first digital mechanical calculator strong enough and reliable enough to be used daily in an office environment. This calculator could add and subtract two numbers directly and could perform long multiplications and divisions effectively by using a movable accumulator for the result ...