1. Gunpowder   Roger Bacon   Dr. Wallace H. Carothers   Dr. William Stokes, Rene Laennec   G. Ferdinand Von Zeppelin   Hint Half-n-half Clue   2. Printing Press   Z. Janssen   Johann Gutenberg   William Siemens   Kirkpatrick Macmillan   Half-n-half Clue   3. Electronic Computer   Dr. William Stokes, Rene Laennec   C. F. Brush   Dr. Alan M. Turing   Lewis E. Waterman   Half-n-half Clue   4. Rabies Vaccine   Louis Pasteur   Edward Jenner   Sir Isaac Pitman   John Napier   Half-n-half Clue   5. Shorthand   Sir Isaac Pitman   Karl Benz   Leo H Baekeland   Z. Janssen   Half-n-half Clue   6. Carburettor   Kirkpatrick Macmillan   C. F. Brush   Gottlieb Daimler   Sir Frank Whittle   Half-n-half Clue   7. Ball-Point Pen   Edmund Cartwright   Bardeen, Shockley, Brattain   Nikola Tesla   John J. Loud   Half-n-half Clue