Unit1One day Palph Waldo Emerson, one of Americas greatest thinkers and philosophers, was visited by a local farmer, who saw a book by Plato in Emersons library and asked to borrow it. When the farmer returned the book, Emerson asked him how he liked it. The farmer replied, “I liked it. this Plato has a lot of my ideas”During an 18-month period in his early 20s, Sir Isaac Newton invented theories of gravity, light, and color, as well as calculus. At age 85, shortly before his death, he wro