sulfuric acid synthesis Francis Rogallo (1912–2009), U.S. – Rogallo wing Heinrich Rohrer (1933–2013), together with Gerd Binnig (1947–), Switzerland/Germany – Scanning tunneling microscope Peter I the Great (Pyotr Alexeyevich Romanov), Tsar and Emperor of Russia (1672–1725), Russia – decimal currency, yacht club, sounding line with separating plummet (sounding weight probe) Wilhelm Conrad Röntgen (1845–1923), Germany – the X-ray machine Ida Rosenthal (1886–1973), Belarus/Russia/U.S. – Bra (Maidenform), the standard of cup sizes, nursing bra, full-figured bra, the first seamed uplift bra (all with her husband William) Sidney Rosenthal (1907–1979), U.S. – Magic Marker Eugene Roshal (born 1972), Russia – FAR file manager, RAR file format, WinRAR file archiver Boris Rosing (1869–1933), Russia – CRT television (first television system using CRT on the receiving side) Guido van Rossum (born 1956), The Netherlands – Python (programming language) Michael Rothman, U.S. – UEFI Subrata Roy (scientist) (born 1962), India, U.S. – Wingless Electromagnetic Air Vehicle, Serpentine geometry plasma actuator, micro-scale actuators Jean-François Pilâtre de Rozier (1754–1785), France – Rozière balloon Ernő Rubik (born 1944), Hungary – Rubik's Cube, Rubik's Magic and Rubik's Clock Ernst Ruska (1906–1988), Germany – electron microscope François van Rysselberghe (1846–1893), Belgium – Universal meteorograph, Condenser telephone S Albert Bruce Sabin (1906–1993), U.S. – oral Polio vaccine Alexander Sablukov (1783–1857), Russia – centrifugal fan Şerafeddin Sabuncuoğlu (1385–1468), Turkey – illustrated surgical atlas Gilles Saint-Hilaire (born 1948), Canada – Quasiturbine, Qurbine Andrei Sakharov (1921–1989), Russia – invented explosively pumped flux compression generator, co-developed the Tsar Bomb and tokamak Jonas Edward Salk (1914–1995), U.S. – injection Polio vaccine Robert Salmon (1763–1821), England – agricultural implements Franz San Galli (1824–1908), Poland/Russia (Italian and German descent) – radiator, central heating Frederick Sanger (1918–2013), U.S. – Sanger sequencing (= DNA sequencing) Larry Sanger (born 1968), together with Jimmy Wales, U.S. – Wikipedia Yoshiyuki Sankai (born c. 1957), Japan – Robotic exoskeleton for motion support (medicine) Alberto Santos-Dumont (1873–1932), Brazil – non-rigid airship and airplane Arthur William Savage (1857–1938) – radial tires, gun magazines, Savage Model 99 lever action rifle Thomas Savery (1650–1715), UK – steam engine Adolphe Sax (1814–1894), Belgium – saxophone Vincent Joseph Schaefer (1906–1993), U.S. – Cloud seeding by dry ice Bela Schick (1877–1967), Hungary – diphtheria test Wilhelm Schickard (1592–1635), Germany – mechanical calculator Hugo Schiff (1834–1915), Germany – Schiff test (histology) Pavel Schilling (1786–1837), Estonia/Russia – first electromagnetic telegraph, mine with an electric fuse Gilmore Schjeldahl (1912–2002), U.S. – Airsickness bag Hubert