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  2. Boeing X-48 - Wikipedia

    en.wikipedia.org/wiki/Boeing_X-48

    The Boeing X-48 is an American experimental unmanned aerial vehicle (UAV) built to investigate the characteristics of blended wing body (BWB) aircraft. Boeing designed the X-48 and two examples were built by Cranfield Aerospace in the UK. Boeing began flight testing the X-48B version for NASA in 2007. The X-48B was later modified into the X-48C ...

  3. Coupon collector's problem - Wikipedia

    en.wikipedia.org/wiki/Coupon_collector's_problem

    Coupon collector's problem. In probability theory, the coupon collector's problem refers to mathematical analysis of "collect all coupons and win" contests. It asks the following question: if each box of a given product (e.g., breakfast cereals) contains a coupon, and there are n different types of coupons, what is the probability that more ...

  4. Boeing X-45 - Wikipedia

    en.wikipedia.org/wiki/Boeing_X-45

    United States Air Force. Number built. 2. Variants. Phantom Ray. Boeing X-46. The Boeing X-45 unmanned combat air vehicle is a concept demonstrator for a next generation of completely autonomous military aircraft, developed by Boeing's Phantom Works. Manufactured by Boeing Integrated Defense Systems, the X-45 was a part of DARPA 's J-UCAS project.

  5. Recycling codes - Wikipedia

    en.wikipedia.org/wiki/Recycling_codes

    Recycling codes are used to identify the materials out of which the item is made, to facilitate easier recycling process. The presence on an item of a recycling code, a chasing arrows logo, or a resin code , is not an automatic indicator that a material is recyclable; it is an explanation of what the item is made of.

  6. NASA X-43 - Wikipedia

    en.wikipedia.org/wiki/NASA_X-43

    3. The NASA X-43 was an experimental unmanned hypersonic aircraft with multiple planned scale variations meant to test various aspects of hypersonic flight. It was part of the X-plane series and specifically of NASA 's Hyper-X program developed in the late 1990s. [1] It set several airspeed records for jet aircraft.

  7. Rockwell X-30 - Wikipedia

    en.wikipedia.org/wiki/Rockwell_X-30

    The Rockwell X-30 was an advanced technology demonstrator project for the National Aero-Space Plane ( NASP ), part of a United States project to create a single-stage-to-orbit (SSTO) spacecraft and passenger spaceliner. [1] Started in 1986, it was cancelled in the early 1990s before a prototype was completed, although much development work in ...

  8. 1 − 2 + 3 − 4 + ⋯ - Wikipedia

    en.wikipedia.org/wiki/1_%E2%88%92_2_%2B_3_%E2%88...

    The idea becomes clearer by considering the general series 1 − 2x + 3x 2 − 4x 3 + 5x 4 − 6x 5 + &c. that arises while expanding the expression 1 ⁄ (1+x) 2, which this series is indeed equal to after we set x = 1.

  9. Shades of brown - Wikipedia

    en.wikipedia.org/wiki/Shades_of_brown

    Some shades of Brown. Red Brown ( X11) Pale Brown. Medium Brown. Dark Brown. Light Brown. Shades of brown can be produced by combining red, yellow, and black [1] pigments, or by a combination of orange and black —illustrated in the color box. The RGB color model, that generates all colors on computer and television screens, makes brown by ...

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