1. Hydrogen   Neels H. D. Bohr   Gregor Mendel   Sir J. J. Thompson   Henry Cavendish   Hint Half-n-half Clue   2. Aluminium   Sigmund Freud   Charles Darwin   Euclid   Hans Christian   Half-n-half Clue   3. Calcium   Neels H. D. Bohr   Sigmund Freud   Sir Humphry Davy   Gregor Mendel   Half-n-half Clue   4. Insulin   Sir Humphry Davy   William Harvey   Alexander Fleming   Sir Fredrick Grant Banting   Half-n-half Clue   5. Oxygen   Sir Humphry Davy   Karl Wilheim Scheele   Sir J. J. Thompson   Albert Einstein   Half-n-half Clue   6. Heart Transplant Surgery   William Harvey   Christian Barnard   Hans Christian   Euclid   Half-n-half Clue   7. Theory of Evolution   Karl Wilheim Scheele   Gregor Mendel   Sir Humphry Davy   Charles Darwin   Half-n-half Clue