1. Principles of Geometry   William Harvey   Sir Fredrick Grant Banting   Euclid   Sigmund Freud   Hint Half-n-half Clue   2. Oxygen   William Harvey   Sir Humphry Davy   Anton Von Leeuwenhock   Karl Wilheim Scheele   Half-n-half Clue   3. Pasteurization   Enrico Fermi   Louis Pasteur   William Harvey   Charles Darwin   Half-n-half Clue   4. Penicillin   Wilhelm K. Roentgen   Alexander Fleming   William Harvey   Gregor Mendel   Half-n-half Clue   5. Psychoanalysis   Sir Humphry Davy   Sir Isaac Newton   Sigmund Freud   Sir Fredrick Grant Banting   Half-n-half Clue   6. X-rays   Karl Wilheim Scheele   Gregor Mendel   Wilhelm K. Roentgen   Ronald Ross   Half-n-half Clue   7. Sodium   Alexander Fleming   Sigmund Freud   Michael Faraday   Sir Humphry Davy   Half-n-half Clue