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Thing                      Discoverer          Year         Discoverer's Country/Work
Radio Waves        Heinrich Hertz        1880's           German/Physicist
Micro Waves        Percy Spencer       1965       American/Engineer and                                                                                         Inventor
Infrared Waves    Frederick Herschel  1800      German-British/Astronomer                                                                                     and composer
Visible Light        Isaac Newton    17th century  UK/Physicist and                                                                                              Mathematician
UltraV Waves       Johann Ritter        1801        German/Chemist and                                                                                          philosopher
Xray (Electro     Wilhelm Roentgen     1895       German/Physics Professor
magnetic Radi
Gamma rays          Paul Villard           1900     French/Chemist and Physicist