1. Theory of Evolution   Ronald Ross   Henry Cavendish   Sir Humphry Davy   Charles Darwin   Hint Half-n-half Clue   2. Malaria is carried by mosquitoes   Albert Einstein   Sir Humphry Davy   Ronald Ross   Karl Wilheim Scheele   Half-n-half Clue   3. Hydrogen   Sigmund Freud   Sir Isaac Newton   Henry Cavendish   Wilhelm K. Roentgen   Half-n-half Clue   4. X-rays   Sir Humphry Davy   Euclid   Wilhelm K. Roentgen   Enrico Fermi   Half-n-half Clue   5. Penicillin   Alexander Fleming   Sir Humphry Davy   Johan Kepler   Ronald Ross   Half-n-half Clue   6. Oxygen   Karl Wilheim Scheele   Ronald Ross   Sir Humphry Davy   Anton Von Leeuwenhock   Half-n-half Clue   7. Potassium   Hans Christian   Sir Humphry Davy   Anton Von Leeuwenhock   Euclid   Half-n-half Clue