1. Electric Flat Iron   Otto von Guericke   H. W. Seeley   Bardeen, Shockley, Brattain   Johann Gutenberg   Hint Half-n-half Clue   2. Vaccination   Edward Jenner   John J. Loud   Karl Benz   G. Ferdinand Von Zeppelin   Half-n-half Clue   3. Airship (rigid)   H. W. Seeley   Leo H Baekeland   G. Ferdinand Von Zeppelin   Dr. William Stokes, Rene Laennec   Half-n-half Clue   4. Nylon   Edward Jenner   Nikola Tesla   John J. Loud   Dr. Wallace H. Carothers   Half-n-half Clue   5. Bicycle   Karl Benz   John J. Loud   Andre-Marie Ampere   Kirkpatrick Macmillan   Half-n-half Clue   6. Internal Combustion Engine   Edmund Cartwright   Edward Jenner   Otto   John Napier   Half-n-half Clue   7. Gunpowder   Roger Bacon   Lewis E. Waterman   Nikola Tesla   Johann Gutenberg   Half-n-half Clue