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Ever wondered how to confirm if the Earth is either flat or round, and then how to calculate its circumference using only sticks, feet, and some brains? Carl Sagan explains how.

Ever wondered how to confirm if the Earth is either flat or round, and then how to calculate its circumference using only sticks, feet, and some brains? Carl Sagan explains how.

Video Credits to: u/Bucephalus_326BC
< Previous Dance of mars and Jupiter When emperor penguin chicks leave their nesting colonies at around 5 months of age, they head to the sea. The chicks are often unaccompanied, and it can be a long and dangerous journey. When these chicks encountered a giant petrel, an intrepid Adelie peng Next >
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