1. Laboratory Gas Burner   John J. Loud   Karl Benz   Robert Wilhelm Von Bunsen   Edmund Cartwright   Hint Half-n-half Clue   2. Bakelite   Leo H Baekeland   Evangelista Torricelli   Robert Wilhelm Von Bunsen   Sir Isaac Pitman   Half-n-half Clue   3. Logarithmic Tables   Sir Frank Whittle   Bardeen, Shockley, Brattain   John Napier   Johann Gutenberg   Half-n-half Clue   4. Printing Press   Johann Gutenberg   Otto   Evangelista Torricelli   Roger Bacon   Half-n-half Clue   5. Microscope   Kirkpatrick Macmillan   Z. Janssen   David Bushnell   Leo H Baekeland   Half-n-half Clue   6. Electronic Computer   Dr. Alan M. Turing   Sir Isaac Pitman   Sir Frank Whittle   Leo H Baekeland   Half-n-half Clue   7. Stethoscope   Leo H Baekeland   Z. Janssen   Kirkpatrick Macmillan   Dr. William Stokes, Rene Laennec   Half-n-half Clue