The shadow cast by an obelisk teaches more than a thousand w... - Eratosthenes

"The shadow cast by an obelisk teaches more than a thousand words of description."

Eratosthenes

Mathematician Geographer Ancient Greece 276–194

More from Eratosthenes

"Measure the Earth and you measure the heavens."

"Knowledge is the greatest treasure of all."

"The pursuit of truth requires courage and perseverance."

"In mathematics, all things are possible."