1. astronomia   geometry   calculus   history   astronomy   Hint Half-n-half Clue   2. storia   chemistry   psychology   geography   history   Half-n-half Clue   3. fisica   zoology   algebra   physics   calculus   Half-n-half Clue   4. chimica   chemistry   geometry   geography   trigonometry   Half-n-half Clue   5. calcolo   physics   biology   calculus   geography   Half-n-half Clue   6. zoologia   psychology   zoology   geometry   trigonometry   Half-n-half Clue   7. algebra   geology   geometry   algebra   astronomy   Half-n-half Clue