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  2. 30 by 30 - Wikipedia

    en.wikipedia.org/wiki/30_by_30

    30 by 30 (or 30x30) is a worldwide initiative for governments to designate 30% of Earth's land and ocean area as protected areas by 2030. [1] [2] The target was proposed by a 2019 article in Science Advances , "A Global Deal for Nature: Guiding principles, milestones, and targets", highlighting the need for expanded nature conservation efforts ...

  3. Penile-vaginal intercourse - Wikipedia

    en.wikipedia.org/wiki/Penile-vaginal_intercourse

    Penile-vaginal intercourse or vaginal intercourse is a form of penetrative sexual intercourse in human sexuality, in which an erect penis is inserted into a vagina. [1] Synonyms are: vaginal sex, cohabitation, coitus ( Latin: coitus per vaginam ), (in elegant colloquial language) intimacy, or (poetic) lovemaking.

  4. 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 brand of cereals contains a coupon, and there are n different types of coupons, what is the probability that more than t boxes need to be ...

  5. Northwest Airlines - Wikipedia

    en.wikipedia.org/wiki/Northwest_Airlines

    The original name of the WorldPerks program was the Northwest Orient Airlines Free Flight Plan, which began in 1981. The original program used paper coupons and gave credit for flight segments. Upon renaming the program to "WorldPerks" in 1986, a mileage-based system was used.

  6. Coupon (finance) - Wikipedia

    en.wikipedia.org/wiki/Coupon_(finance)

    In finance, a coupon is the interest payment received by a bondholder from the date of issuance until the date of maturity of a bond . Coupons are normally described in terms of the "coupon rate", which is calculated by adding the sum of coupons paid per year and dividing it by the bond's face value. For example, if a bond has a face value of ...

  7. Smartphone - Wikipedia

    en.wikipedia.org/wiki/Smartphone

    In 2013, the Samsung Galaxy Note 3 introduced 2160p (4K) video recording at 30 frames per second, as well as 1080p doubled to 60 frames per second for smoothness. Other vendors adapted 2160p recording in 2014, including the optically stabilized LG G3. Apple first implemented it in late 2015 on the iPhone 6s and 6s Plus.