On top of all of his basic information, I'm required to find at least 2 of his achievements shown with diagram or formula (10 points), an explanation (10 points), and how we use it today (another 10 points)....could you please help me with that because I haven't seen any formulas in his book entitled "Elements" and I'd like to know more about "Phenomena"...so if you could please help me with that and follow the rubric above please! Thanks!