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If every human lined up facing north with their arms outstretched and touching, at what latitude would this closed circle be?
Mike Follows
Sutton Coldfield, West Midlands, UK
If the world’s population stood on the equator with outstretched arms and fingers touching, there would be enough people to circle Earth more than 300 times.
The arm span of a person is close to their height, and the average height of an adult Homo sapiens is 168.5 centimetres.
The average radius of Earth is 6371 kilometres, but because the planet is slightly oblate (fatter around its middle), the equatorial circumference is…
