1. Hovercraft   Christopher Cockerell   Evangelista Torricelli   William Siemens   Andre-Marie Ampere   Hint Half-n-half Clue   2. Stethoscope   Dr. Alan M. Turing   Nikola Tesla   Dr. William Stokes, Rene Laennec   Gottlieb Daimler   Half-n-half Clue   3. Bakelite   Otto von Guericke   Alessandro Volta   David Bushnell   Leo H Baekeland   Half-n-half Clue   4. Microscope   Z. Janssen   Dr. Alan M. Turing   James Harrison, Alexander Catlin   Lewis E. Waterman   Half-n-half Clue   5. Vaccination   Nikola Tesla   Edward Jenner   Dr. Wallace H. Carothers   Gottlieb Daimler   Half-n-half Clue   6. Gunpowder   Sir Frank Whittle   Roger Bacon   Christopher Cockerell   Johann Gutenberg   Half-n-half Clue   7. Submarine   David Bushnell   Nikola Tesla   G. Ferdinand Von Zeppelin   Z. Janssen   Half-n-half Clue