Science Experiments for Kids

 Alexander Procofieff de Seversky, (1894–1974) ..................................................................... 119

 Alexander Prokhorov, (1916–2002) ........................................................................................ 119

 Petro Prokopovych, (1775–1850) ........................................................................................... 119

 Sergey Prokudin-Gorsky, (1863–1944) ................................................................................... 119

 George Pullman, (1831–1897) ................................................................................................ 119

 Michael I. Pupin, (1858–1935) ................................................................................................ 119

 Tivadar Puskas, (1844–1893) .................................................................................................. 119

R .......................................................................................................................................................... 119

 Mario Rabinowitz, (1936–)...................................................................................................... 119

 Hasan al-Rammah, (fl.1270s) .................................................................................................. 119

 Harun al-Rashid, (763-809) ..................................................................................................... 119

 Muhammad ibn Zakarīya Rāzi (Rhazes), (865–965) ................................................................ 119

 Alec Reeves, (1902–1971) ....................................................................................................... 119

 Karl von Reichenbach, (1788–1869) ....................................................................................... 119

 Ira Remsen, (1846–1927) ........................................................................................................ 119

 Ralf Reski, (* 1958) .................................................................................................................. 119

 Josef Ressel, (1793–1857) ....................................................................................................... 119

 Charles Francis Richter, (1900–1985) ..................................................................................... 119

 Adolph Rickenbacker, (1886–1976) ........................................................................................ 119

 Hyman George Rickover, (1900–1986) ................................................................................... 119

 John Roebuck, (1718–1794) .................................................................................................... 119

 Heinrich Rohrer, (1933–)......................................................................................................... 119

 Peter I the Great (Pyotr Alexeyevich Romanov), Tsar and Emperor of Russia, (1672–1725). 119

 Wilhelm Conrad Röntgen, (1845–1923) ................................................................................. 119

 Ida Rosenthal, (1886–1973) .................................................................................................... 119

 Boris Rosing, (1869–1933) ...................................................................................................... 119

 Eugene Roshal, (born 1972) .................................................................................................... 119

 Ernő Rubik, (1944–) ................................................................................................................. 120

 Ernst Ruska, (1906–1988) ....................................................................................................... 120

S ........................................................................................................................................................... 120

 Alexander Sablukov, (1783–1857) .......................................................................................... 120

 Şerafeddin Sabuncuoğlu, (1385–1468) ................................................................................... 120

 Andrei Sakharov, (1921–1989) ............................................................................................... 120