1. Oxygen   Karl Wilheim Scheele   Wilhelm K. Roentgen   Euclid   Neels H. D. Bohr   Hint Half-n-half Clue   2. Hydrogen   Euclid   Neels H. D. Bohr   Sir Fredrick Grant Banting   Henry Cavendish   Half-n-half Clue   3. Theory of Evolution   Henry Cavendish   Gregor Mendel   Charles Darwin   Sir Humphry Davy   Half-n-half Clue   4. Sodium   Anton Von Leeuwenhock   Sir Humphry Davy   Euclid   Sir Fredrick Grant Banting   Half-n-half Clue   5. Penicillin   Charles Darwin   Albert Einstein   Sigmund Freud   Alexander Fleming   Half-n-half Clue   6. Theory of Relativity   Sir Humphry Davy   Hans Christian   Albert Einstein   Wilhelm K. Roentgen   Half-n-half Clue   7. X-rays   Sir Humphry Davy   Sir Fredrick Grant Banting   Gregor Mendel   Wilhelm K. Roentgen   Half-n-half Clue