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  2. 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 ...

  3. Adderall - Wikipedia

    en.wikipedia.org/wiki/Adderall

    Adderall is commonly used to treat attention deficit hyperactivity disorder (ADHD) and narcolepsy (a sleep disorder).. ADHD. Long-term amphetamine exposure at sufficiently high doses in some animal species is known to produce abnormal dopamine system development or nerve damage, but, in humans with ADHD, long-term use of pharmaceutical amphetamines at therapeutic doses appears to improve brain ...

  4. Portal:Current events - Wikipedia

    en.wikipedia.org/wiki/Portal:Current_events

    The death toll from a tornado outbreak in the U.S. states of Texas, Kentucky, Oklahoma, and Arkansas on Saturday and Sunday increases to 21. (Reuters) Law and crime. A teenager is killed and six other people are injured in a shooting in downtown Lansing, Michigan, United States.

  5. United States dollar - Wikipedia

    en.wikipedia.org/wiki/United_States_dollar

    The nickel is the only coin whose size and composition (5 grams, 75% copper, and 25% nickel) is still in use from 1865 to today, except for wartime 1942–1945 Jefferson nickels which contained silver. Due to the penny's low value, some efforts have been made to eliminate the penny as circulating coinage.

  6. Sun - Wikipedia

    en.wikipedia.org/wiki/Sun

    The Sun is a G-type main-sequence star that makes up about 99.86% of the mass of the Solar System. It has an absolute magnitude of +4.83, estimated to be brighter than about 85% of the stars in the Milky Way, most of which are red dwarfs. [32] [33] The Sun is a Population I, or heavy-element-rich, [b] star. [34]

  7. Africa - Wikipedia

    en.wikipedia.org/wiki/Africa

    Africa is the world's second largest and second-most populous continent after Asia. At about 30.3 million km 2 (11.7 million square miles) including adjacent islands, it covers 20% of Earth 's land area and 6% of its total surface area. [7] With 1.4 billion people [1] [2] as of 2021, it accounts for about 18% of the world's human population.

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