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  2. History of ExxonMobil - Wikipedia

    en.wikipedia.org/wiki/History_of_ExxonMobil

    ExxonMobil, an American multinational oil and gas corporation presently based out of Texas, has had one of the longest histories of any company in its industry.A direct descendant of John D. Rockefeller's Standard Oil, the company traces its roots as far back as 1886 to the founding of the Vacuum Oil Company, which would become part of ExxonMobil through its own merger with Mobil during the 1930s.

  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 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 ...

  4. 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 ...

  5. Gamma ray - Wikipedia

    en.wikipedia.org/wiki/Gamma_ray

    A gamma ray, also known as gamma radiation (symbol. γ. ), is a penetrating form of electromagnetic radiation arising from the radioactive decay of atomic nuclei. It consists of the shortest wavelength electromagnetic waves, typically shorter than those of X-rays. With frequencies above 30 exahertz ( 3 × 1019 Hz) and wavelengths less than 10 ...

  6. Lithium-ion battery - Wikipedia

    en.wikipedia.org/wiki/Lithium-ion_battery

    A lithium-ion or Li-ion battery is a type of rechargeable battery that uses the reversible intercalation of Li + ions into electronically conducting solids to store energy. In comparison with other commercial rechargeable batteries, Li-ion batteries are characterized by higher specific energy, higher energy density, higher energy efficiency, a ...

  7. Dark matter - Wikipedia

    en.wikipedia.org/wiki/Dark_matter

    History Early history. The hypothesis of dark matter has an elaborate history. In the appendices of the book Baltimore lectures on molecular dynamics and the wave theory of light where the main text was based on a series of lectures given in 1884, Lord Kelvin discussed the potential number of stars around the Sun from the observed velocity dispersion of the stars near the Sun, assuming that ...