1. Laws of Gravitation   Wilhelm K. Roentgen   Sir Isaac Newton   Henry Cavendish   Anton Von Leeuwenhock   Hint Half-n-half Clue   2. Potassium   Sir Humphry Davy   Euclid   Louis Pasteur   Alexander Fleming   Half-n-half Clue   3. Magnesium   Anton Von Leeuwenhock   Sir Humphry Davy   Euclid   William Harvey   Half-n-half Clue   4. Bacteria   Charles Darwin   Henry Cavendish   Anton Von Leeuwenhock   Sigmund Freud   Half-n-half Clue   5. Theory of Evolution   Sir Humphry Davy   Neels H. D. Bohr   Charles Darwin   Gregor Mendel   Half-n-half Clue   6. Psychoanalysis   Ronald Ross   Louis Pasteur   Anton Von Leeuwenhock   Sigmund Freud   Half-n-half Clue   7. Hydrogen   Sigmund Freud   Henry Cavendish   Sir Humphry Davy   Sir J. J. Thompson   Half-n-half Clue