6:42

Carl Sagan - Cosmos - Eratosthenes

9:04

Physical Science 9.1f - Eratosthenes

3:57

Eratosthenes: Biography of a Great Thinker

13:32

Toccata for Toy Trains (1957)

4:52

The Sieve of Eratosthenes

7:38

Tops (1969)

2:14

Carl Sagan explains how Eratosthenes calculated circumference of the Earth

9:01

Powers of Ten™ (1977)