21 Jul 1694 Georg Rushd Brandt - Swedish chemist - Discovered, isolated and named a metal cobalt (1730).
21 Jul 1810 Henri-Victor Regnault - French scientist - worked on the properties of gases. His experiments include procedures for determining the specific heat of solids, liquids, gases, and the vapour-tensions of water and other volatile liquids, as well as their latent heat at different temperatures.
21 Jul 1881 George Frederick Dick - American physician and pathologist - isolated the hemolytic streptococcus that was the cause of, and developed an immunization to treat, the dangerous scarlet fever
21 July 1923 Rudolph A. Marcus - Nobel Prize in Chemistry - Electron Transfer Reactions
1904 - after 13 years of work, the 4,607-mile Trans-Siberian railway was completed and opened up for use in Russia.
1955 - Ian Donald made his first investigation of the use of ultrasound in medical diagnosis.
1969 - Apollo XI astronauts Neil Armstrong and Edwin "Buzz" Aldrin blasted off from the moon after 21 1/2 hours on the surface and returned to the command module piloted by Michael Collins.
2000 - an international collaboration of scientists at the Department of Energy's Fermi National Accelerator Laboratory announced the first direct evidence for the subatomic particle called the tau neutrino, the third kind of neutrino known to particle physicists.
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