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  3. Potassium-40 - Wikipedia

    en.wikipedia.org/wiki/Potassium-40

    Potassium-40 ( 40K) is a radioactive isotope of potassium which has a long half-life of 1.25 billion years. It makes up about 0.012% (120 ppm) of the total amount of potassium found in nature. Potassium-40 undergoes three types of radioactive decay. In about 89.28% of events, it decays to calcium-40 ( 40 Ca) with emission of a beta particle (β ...

  4. Headphones - Wikipedia

    en.wikipedia.org/wiki/Headphones

    Headphones are also known as earphones [1] or, colloquially, cans. [2] Circumaural (around the ear) and supra-aural (over the ear) headphones use a band over the top of the head to hold the drivers in place. Another type, known as earbuds or earpieces, [1] consists of individual units that plug into the user's ear canal.

  5. 40 (number) - Wikipedia

    en.wikipedia.org/wiki/40_(number)

    40 is the smallest number with exactly nine solutions to the equation Euler's totient function (for values 41, 55, 75, 82, 88, 100, 110, 132, and 150 of ). Adding up some subsets of the divisors of 40 (e.g., 1, 4, 5, 10, and 20) gives 40; hence, 40 is the ninth semiperfect number. [6] 40 is also the ninth refactorable number.

  6. 40–40 club - Wikipedia

    en.wikipedia.org/wiki/40–40_club

    It took another 30 years for another player to come close to 4040, as Willie Mays did in 1956 with 36 home runs and 40 stolen bases. Bobby Bonds hit his 38th home run of the season on September 9, 1973, but came up one home run shy of becoming the founding member of the club after hitting just one home run in the Giants' final 21 games.

  7. Golden ratio - Wikipedia

    en.wikipedia.org/wiki/Golden_ratio

    The golden ratio is also an algebraic number and even an algebraic integer. It has minimal polynomial. This quadratic polynomial has two roots, and. The golden ratio is also closely related to the polynomial. which has roots and As the root of a quadratic polynomial, the golden ratio is a constructible number.

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