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  2. 1981 in music - Wikipedia

    en.wikipedia.org/wiki/1981_in_music

    February 9 – Bill Haley, rock and roll pioneer, 55 (heart attack) February 15. Mike Bloomfield, blues guitarist, 37 (accidental drug overdose) Karl Richter, German organist and conductor, 54. February 19 – Olive Gilbert, actress and singer, 82. February 21 – Ron Grainer, electronic music pioneer and composer, 58.

  3. Strontium - Wikipedia

    en.wikipedia.org/wiki/Strontium

    Strontium is a chemical element; it has symbol Sr and atomic number 38. An alkaline earth metal, strontium is a soft silver-white yellowish metallic element that is highly chemically reactive. The metal forms a dark oxide layer when it is exposed to air. Strontium has physical and chemical properties similar to those of its two vertical ...

  4. Joan Van Ark - Wikipedia

    en.wikipedia.org/wiki/Joan_Van_Ark

    Joan Van Ark (born June 16, 1943) [1] is an American actress. She is best known for her role as Valene Ewing on the primetime soap opera Knots Landing. A life member of The Actors Studio, [2] she made her Broadway debut in 1966 in Barefoot in the Park. In 1971, she received a Theatre World Award and was nominated for the Tony Award for Best ...

  5. Characteristic X-ray - Wikipedia

    en.wikipedia.org/wiki/Characteristic_X-ray

    Characteristic X-ray. Characteristic X-rays are emitted when outer- shell electrons fill a vacancy in the inner shell of an atom, releasing X-rays in a pattern that is "characteristic" to each element. Characteristic X-rays were discovered by Charles Glover Barkla in 1909, [1] who later won the Nobel Prize in Physics for his discovery in 1917.

  6. Structure factor - Wikipedia

    en.wikipedia.org/wiki/Structure_factor

    In condensed matter physics and crystallography, the static structure factor (or structure factor for short) is a mathematical description of how a material scatters incident radiation. The structure factor is a critical tool in the interpretation of scattering patterns ( interference patterns) obtained in X-ray, electron and neutron ...

  7. Dick Cheney - Wikipedia

    en.wikipedia.org/wiki/Dick_Cheney

    Richard Bruce Cheney ( / ˈtʃeɪni / CHAY-nee; [a] born January 30, 1941) is an American retired politician and businessman who served as the 46th vice president of the United States from 2001 to 2009 under President George W. Bush. Often cited as the most powerful vice president in American history, [4] [5] Cheney previously served as White ...