1. Carburettor   Z. Janssen   Karl Benz   Louis Pasteur   Gottlieb Daimler   Hint Half-n-half Clue   2. Jet Engine   John Napier   Otto von Guericke   Evangelista Torricelli   Sir Frank Whittle   Half-n-half Clue   3. Hovercraft   Christopher Cockerell   Edmund Cartwright   Dr. Alan M. Turing   Johann Gutenberg   Half-n-half Clue   4. Electric Battery   Alessandro Volta   Christopher Cockerell   John J. Loud   Gottlieb Daimler   Half-n-half Clue   5. Barometer   Sir Frank Whittle   Dr. Wallace H. Carothers   Evangelista Torricelli   William Siemens   Half-n-half Clue   6. Vaccination   Dr. William Stokes, Rene Laennec   Edmund Cartwright   Lewis E. Waterman   Edward Jenner   Half-n-half Clue   7. Internal Combustion Engine   Otto   Bardeen, Shockley, Brattain   James Harrison, Alexander Catlin   C. F. Brush   Half-n-half Clue