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  2. Ring binder - Wikipedia

    en.wikipedia.org/wiki/Ring_binder

    A ring binder, folded. Ring binders (loose leaf binders, looseleaf binders, or sometimes called files in Britain) are large folders that contain file folders or hole punched papers (called loose leaves). These binders come in various sizes and can accommodate an array of paper sizes. These are held in the binder by circular or D-shaped ...

  3. 8 Back-to-School Items That Are a Waste of Money in 2024

    www.aol.com/finance/8-back-school-items-waste...

    Massive Binders. Estimated price: $15 and up. Trapper Keepers and Five Star zippered binders may have been all the rage for older millennials, but they aren’t as beloved in today’s classrooms ...

  4. Trapper Keeper - Wikipedia

    en.wikipedia.org/wiki/Trapper_Keeper

    A Pink Five Star Trapper Keeper. Trapper Keeper is a brand of loose-leaf binder created by Mead.Popular with students in the United States and parts of Latin America from the 1970s to the 1990s, it featured sliding plastic rings (instead of standard snap-closed metal binder rings), folders, and pockets to keep schoolwork and papers, and a wrap-around flap with a Velcro closure (originally a ...

  5. Gideon Sundback - Wikipedia

    en.wikipedia.org/wiki/Gideon_Sundback

    Electrical engineer. Known for. Invention of the zipper. Spouse. Elvira Aronson. . (m. 1909) . Otto Fredrik Gideon Sundbäck (April 24, 1880 – June 21, 1954) was a Swedish-American electrical engineer, who is most commonly associated with his work in the development of the zipper. [1]

  6. 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 ...

  7. Extreme Couponing - Wikipedia

    en.wikipedia.org/wiki/Extreme_Couponing

    Extreme couponing is an activity that combines shopping skills with couponing in an attempt to save as much money as possible while accumulating the most groceries. The concept of "extreme couponers" was first mentioned by The Wall Street Journal on March 8, 2010, in an article entitled "Hard Times Turn Coupon Clipping Into the Newest Extreme Sport". [2]

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