Across
- 3. A league is equivalent to how many nautical miles at sea (5)
- 4. Gland in the human body that regulates metabolism (7)
- 6. First successful vaccine developed by Edward Jenner in 1796 (8)
- 8. World's fastest growing plant species (6)
- 11. Chemical element with the symbol Au (5)
- 12. Name for a protein that acts as a biological catalyst (7)
- 14. Schrodinger's cat is a thought experiment dealing with which type of mechanics (7)
- 15. Coulrophobia is the fear of what (6)
- 17. Acronym for The European Organization for Nuclear Research (4)
- 19. Igneous rock with less density than water(6)
- 20. Name of first mammal cloned from an adult cell (5)
Down
- 1. Element with atomic weight of 1.00794 on periodic table (8)
- 2. Pigment that gives colour to skin (7)
- 4. Element that makes the filament in an incandescent light bulb (8)
- 5. Stratus and cumulus are types of these (6)
- 7. Gives red blood cells their colour (10)
- 9. Penicillin is used to fight what type of infections (9)
- 10. Inorganic material produced by lightning (5)
- 13. Greek mathematician considered the found of Geometry (6)
- 16. Inferior and fata morgana are types of what optical illusion (6)
- 18. Heavy metal element once known as quicksilver (7)