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2. High-yield savings rates for September 20, 2024 - AOL

   www.aol.com/finance/savings-interest-rates-today...

   At the conclusion of its sixth rate-setting policy meeting of 2024 on September 18, 2024, the Federal Reserve announced it was lowering the federal funds target interest rate by 50 basis points to ...

3. Free-piston linear generator - Wikipedia

   en.wikipedia.org/wiki/Free-piston_linear_generator

   The free-piston engine linear generators can be divided in 3 subsystems: [1] [2] One (or more) reaction section with a single or two opposite pistons; One (or more) linear electric generator, which is composed of a static part (the stator) and a moving part (the magnets) connected to the connection rod.

4. Kamov Ka-50 - Wikipedia

   en.wikipedia.org/wiki/Kamov_Ka-50

   A Ka-50 provided cover for the landing of troops and then worked on the ground targets using its cannons and rockets. [20] India issued a request for proposal for 22 attack helicopters for the Indian Air Force in May 2008. [113] The Ka-50, the Mil Mi-28, and the Eurocopter Tiger were the front-runners for this order as of October 2008. [114]

5. QR code - Wikipedia

   en.wikipedia.org/wiki/QR_Code

   The QR code system was invented in 1994, at the Denso Wave automotive products company, in Japan. [5] [6] [7] The initial alternating-square design presented by the team of researchers, headed by Masahiro Hara, was influenced by the black counters and the white counters played on a Go board; [8] the pattern of position detection was found and determined by applying the least-used ratio (1:1:3 ...

6. Buy one, get one free - Wikipedia

   en.wikipedia.org/wiki/Buy_one,_get_one_free

   The economist Alex Tabarrok has argued, that the success of this promotion lies in the fact that consumers value the first unit significantly more than the second one. So compared to a seemingly equivalent "Half price off" promotion, they may only buy one item at half price, because the value they attach to the second unit is lower than even the discounted price.

7. Coupon collector's problem - Wikipedia

   en.wikipedia.org/wiki/Coupon_collector's_problem

   An alternative statement is: given n coupons, how many coupons do you expect you need to draw with replacement before having drawn each coupon at least once? The mathematical analysis of the problem reveals that the expected number of trials needed grows as Θ ( n log ⁡ ( n ) ) {\displaystyle \Theta (n\log(n))} .