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  2. Curta - Wikipedia

    en.wikipedia.org/wiki/Curta

    The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.

  3. Check digit - Wikipedia

    en.wikipedia.org/wiki/Check_digit

    The final digit of a Universal Product Code, International Article Number, Global Location Number or Global Trade Item Number is a check digit computed as follows: [3] [4]. Add the digits in the odd-numbered positions from the left (first, third, fifth, etc.—not including the check digit) together and multiply by three.

  4. Calculator - Wikipedia

    en.wikipedia.org/wiki/Calculator

    Made in Japan, this was also the first calculator to use an LED display, the first hand-held calculator to use a single integrated circuit (then proclaimed as a "calculator on a chip"), the Mostek MK6010, and the first electronic calculator to run off replaceable batteries. Using four AA-size cells the LE-120A measures 4.9 by 2.8 by 0.9 inches ...

  5. MegaTruckers - Wikipedia

    en.wikipedia.org/wiki/MegaTruckers

    MegaTruckers is an Australian reality television series which premiered on the A&E channel in 2012. [1] The eight part, 30 minute series is produced by Cordell Jigsaw. It profiles Jon Kelly and the trucking fleet at his Brisbane-based trucking company Heavy Haulage Australia.

  6. Luhn algorithm - Wikipedia

    en.wikipedia.org/wiki/Luhn_algorithm

    The check digit is calculated by (()), where s is the sum from step 3. This is the smallest number (possibly zero) that must be added to s {\displaystyle s} to make a multiple of 10. Other valid formulas giving the same value are 9 − ( ( s + 9 ) mod 1 0 ) {\displaystyle 9-((s+9){\bmod {1}}0)} , ( 10 − s ) mod 1 0 {\displaystyle (10-s){\bmod ...

  7. Las Vegas police say Cybertruck that exploded at Trump hotel ...

    www.aol.com/news/las-vegas-police-cybertruck...

    The Las Vegas Metropolitan Police Department and FBI are investigating the explosion of a Tesla Cybertruck in front of the Trump hotel in Vegas, that left 1 dead.

  8. Australian Open 2025: How to watch on TV, betting odds and ...

    www.aol.com/australian-open-2025-watch-tv...

    The two singles champions each will receive 3.5 million Australian dollars (about $2.15 million), up from 3.15 million Australian dollars (about $1.95 million) a year ago, but still below the pre ...

  9. List of trigonometric identities - Wikipedia

    en.wikipedia.org/wiki/List_of_trigonometric...

    Ptolemy's theorem states that the sum of the products of the lengths of opposite sides is equal to the product of the lengths of the diagonals. When those side-lengths are expressed in terms of the sin and cos values shown in the figure above, this yields the angle sum trigonometric identity for sine: sin(α + β) = sin α cos β + cos α sin β.