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  2. Speed of light - Wikipedia

    en.wikipedia.org/wiki/Speed_of_Light

    Similarly, a time dilation factor of γ = 10 occurs at 99.5% the speed of light (v = 0.995 c). The results of special relativity can be summarized by treating space and time as a unified structure known as spacetime (with c relating the units of space and time), and requiring that physical theories satisfy a special symmetry called Lorentz ...

  3. John D. Rockefeller - Wikipedia

    en.wikipedia.org/wiki/John_D._Rockefeller

    The cartel offered preferential treatment as a high-volume shipper, which included not just steep discounts/rebates of up to 50% for their product but rebates for the shipment of competing products. Rockefeller in 1875. By then, he shaved off his sideburns, leaving his iconic mustache. Share of the Standard Oil Company, issued May 1, 1878

  4. Confidence interval - Wikipedia

    en.wikipedia.org/wiki/Confidence_interval

    A confidence interval for the parameter , with confidence level or coefficient , is an interval determined by random variables and with the property: The number , whose typical value is close to but not greater than 1, is sometimes given in the form (or as a percentage ), where is a small positive number, often 0.05.

  5. Schrödinger's cat - Wikipedia

    en.wikipedia.org/wiki/Schrödinger's_cat

    Schrödinger's cat: a cat, a flask of poison, and a radioactive source connected to a Geiger counter are placed in a sealed box. As illustrated, the quantum description uses a superposition of an alive cat and one that has died. In quantum mechanics, Schrödinger's cat is a thought experiment, sometimes described as a paradox, of quantum ...

  6. Walmart - Wikipedia

    en.wikipedia.org/wiki/Walmart

    Walmart Inc. /  36.36556°N 94.21750°W  / 36.36556; -94.21750. Walmart Inc. ( / ˈwɔːlmɑːrt / ⓘ; formerly Wal-Mart Stores, Inc.) is an American multinational retail corporation that operates a chain of hypermarkets (also called supercenters), discount department stores, and grocery stores in the United States, headquartered in ...

  7. Electron - Wikipedia

    en.wikipedia.org/wiki/Electron

    The invariant mass of an electron is approximately 9.109 × 10 −31 kg, or 5.489 × 10 −4 Da. Due to mass–energy equivalence, this corresponds to a rest energy of 0.511 MeV (8.19 × 10 −14 J). The ratio between the mass of a proton and that of an electron is about 1836.

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