The Librarian Who Measured the Earth

The biography of the ancient Greek mathematician and librarian, Erastothenes,  who measured the circumference of the earth, with an error of only 200 miles, at a time when people didn’t even know for sure the earth was round, using math alone. There is a complete set of teaching ideas for this book at

  1.  My stories about going to the library, taking out books, reading on a tablet.
  2.  Eratosthenes had the nickname Pentathlus meaning champion in 5 contests – in his case intellectual ones. Talk about championships (or near championships) in your life. What are your major intellectual “championships?” Why?
  3.  Eratosthenes’ nickname was Pentathlus. Talk about nicknames – yours, others, opinions about nicknames, etc.
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