Gravity is the weakest of nature’s forces, a fact made evident by the simplest demonstration. Pick up a coin. The muscles in your arm beat out the gravitational pull of the entire earth. Whether you consider yourself soft or strapping, victory over the gravitational pull of a planet highlights gravity’s intrinsic weakness. The only reason we’re even aware of gravity is that it’s a cumulative force: every bit of the earth pulls on every bit of a coin, and on every bit of this book, and on every bit of you, and since there’s a whole lot of earth, these pulls add up to downward forces we can
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