1. Rabies Vaccine   Otto von Guericke   C. F. Brush   Louis Pasteur   John Napier   Hint Half-n-half Clue   2. Submarine   David Bushnell   Dr. William Stokes, Rene Laennec   Edward Jenner   James Harrison, Alexander Catlin   Half-n-half Clue   3. Hovercraft   Robert Wilhelm Von Bunsen   H. W. Seeley   Christopher Cockerell   Otto von Guericke   Half-n-half Clue   4. Airship (rigid)   H. W. Seeley   G. Ferdinand Von Zeppelin   Karl Benz   Lewis E. Waterman   Half-n-half Clue   5. Gunpowder   Alessandro Volta   Evangelista Torricelli   John J. Loud   Roger Bacon   Half-n-half Clue   6. Electric Furnace   William Siemens   Z. Janssen   James Harrison, Alexander Catlin   Otto von Guericke   Half-n-half Clue   7. Air Pump   Louis Pasteur   Otto von Guericke   Nikola Tesla   Evangelista Torricelli   Half-n-half Clue