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The fact that the Earth is round has been known since ancient Greece. Eratosthenes demonstrated it with a simple stick and even approximated its radius quite a bit more than two thousand two hundred years ago. What has not been known for so many centuries is that the Earth is flattened at the poles. When was this known? How was it known? Join me in this story that will take us through France, Spain, Ecuador and Lapland, and that begins, like so many scientific stories, with the saintly Isaac Newton. Subscribe to the channel! Follow Eduardo Sáenz de Cabezón: On Twitter: /edusadeci On Instagram: /eduardosdc On Facebook: www.facebook.com/DerivandoYouTube