Description: Henry David Hubbard (1870-1943), a physicist at the U.S. National Bureau of Standards, designed the first edition of the "Periodic Chart of the Atoms" in 1924. The chart is still in use today, continually updated to reflect new elements.
Description: When tragedy struck during the space shuttle era, mourners found a place to honor the fallen astronauts of the tragic Challenger and Columbia flights at Smithsonian’s National Air and Space Museum.