Search results
Results From The WOW.Com Content Network
This timeline of nuclear weapons development is a chronological catalog of the evolution of nuclear weapons rooting from the development of the science surrounding nuclear fission and nuclear fusion. In addition to the scientific advancements, this timeline also includes several political events relating to the development of nuclear weapons.
Robert M. Hazen, summary of mineral evolution in the geologic time context (2008). [1] October 2008: Erika Pohl-Ströher donates her mineral collection to the "TU Bergakademie Freiberg", Freudenstein Castle, "terra mineralia" permanent exhibition. Back, Malcolm E.; Mandarino, Joseph A.; Fleischer, Michael (2008).
The first light bulbs ever lit by electricity generated by nuclear power at EBR-1 at Argonne National Laboratory-West, 20 December 1951. [12] As the first liquid metal cooled reactor, it demonstrated Fermi's breeder reactor principle to maximize the energy obtainable from natural uranium, which at that time was considered scarce.
Uranium is a chemical element with the symbol U and atomic number 92. It is a silvery-grey metal in the actinide series of the periodic table. A uranium atom has 92 protons and 92 electrons, of which 6 are valence electrons. Uranium radioactively decays, usually by emitting an alpha particle.
1895 William Ramsay discovers terrestrial helium by spectroscopically analyzing gas produced by decaying uranium; 1896 Antoine Henri Becquerel discovers the radioactivity of uranium; 1896 Pieter Zeeman studies the splitting of sodium D lines when sodium is held in a flame between strong magnetic poles; 1897 J. J. Thomson discovered the electron;
Obtained by irradiating uranium with neutrons, it was the first transuranium element discovered. [179] Shortly before that, Yoshio Nishina and Kenjiro Kimura discovered the uranium isotope 237 U and found that it beta decays into 237 93, but were unable to measure the activity of the element 93 product because its half-life was too long.
The Neanderthal DNA found in modern human genomes has long raised questions about ancient interbreeding. New studies offer a timeline of when that occurred and when ancient humans left Africa.
This is a timeline of subatomic particle discoveries, including all particles thus far discovered which appear to be elementary (that is, indivisible) given the best available evidence. It also includes the discovery of composite particles and antiparticles that were of particular historical importance.