As aventuras do Geodetetive 1: A circunferência da Terra

Synopsis: Arnold is a young very curious and is always seeking knowledge. At night dives in the books, assumes a new identity and becomes the Geodetetive. On one of these nights, Eratosthenes appears to help you understand how did you determine, for over two thousand years, the measurement of the circumference of the Earth. This is an example of how the observation, logical reasoning and experimentation are important for solving problems and for the development of science.
Source: Unicamp - M3, Mathematics Multimedia.
URL: http://m3.ime.unicamp.br/recursos/1102