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Great question answered by Prof Richard Muller with a joke on the one time gravity killed a man.
https://www.quora.com/Did-Richard-M...RlUbf3a20SKTnkuUW5OYD1NjDrx9WFV31XSMtkEeTy_cE
https://www.quora.com/Did-Richard-M...RlUbf3a20SKTnkuUW5OYD1NjDrx9WFV31XSMtkEeTy_cE