• Linking Past to Present
  • Introduction & Demo Instructions
  • Explore Discovered Elements
  • 1800 & Before
  • 1801-1850
  • 1851-1914
  • 1915-1939
  • 1940-1967
  • 1968-1975
  • 1976-1981
  • 1982-1989
  • 1990-1999
  • 2000 & After