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  2. Birthday problem - Wikipedia

    en.wikipedia.org/wiki/Birthday_problem

    In probability theory, the birthday problem asks for the probability that, in a set of n randomly chosen people, at least two will share a birthday. The birthday paradox refers to the counterintuitive fact that only 23 people are needed for that probability to exceed 50%. The birthday paradox is a veridical paradox: it seems wrong at first ...

  3. Happy Birthday to You - Wikipedia

    en.wikipedia.org/wiki/Happy_Birthday_to_You

    Happy Birthday to You. " Happy Birthday to You ", or simply " Happy Birthday ", is a song traditionally sung to celebrate a person's birthday. According to the 1998 Guinness World Records, it is the most recognized song in the English language, followed by "For He's a Jolly Good Fellow". The song's base lyrics have been translated into at least ...

  4. Lincoln's Birthday - Wikipedia

    en.wikipedia.org/wiki/Lincoln's_Birthday

    Lincoln's Birthday is a legal, public holiday in some U.S. states, observed on the anniversary of Abraham Lincoln's birth on February 12, 1809, in Hodgenville (Hodgensville, Hodgen's Mill), Kentucky. Connecticut , [2] Illinois , [3] Indiana , [4] Michigan , [5] Ohio , [6] California , [7] Missouri , [8] and New York [9] observe the holiday.

  5. 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 ...

  6. Celebrate Planet Earth - Wikipedia

    en.wikipedia.org/wiki/Celebrate_Planet_Earth

    Celebrate Planet Earth, formerly known as Earth's Birthday Project, is a U.S.-based 501(c)(3) environmental educational non-profit organization. History [ edit ] Since Earth's Birthday Project's founding in 1989, it is estimated that more than 15 million school children have participated in butterfly and sunflower activities, as well as ...

  7. California - Wikipedia

    en.wikipedia.org/wiki/California

    California's capital, Sacramento, is located in the Central Valley . Prior to European colonization, California was one of the most culturally and linguistically diverse areas in pre-Columbian North America. European exploration in the 16th and 17th centuries led to the colonization by the Spanish Empire.