Everyone knows what gravity is. A baby at three months will express surprise if a box does not topple as expected; a one-year-old knows whether a precarious object will fall or not depending on its shape. Scientists came to think of gravity as a pull to Earth and later, in a more generalized way, as a force of attraction between any two masses.
Then came Albert Einstein. In 1915 he revealed in his general theory of relativity that gravity is not a force so much as the by-product of a curving universe. In other words, what we think we know about gravity from everyday experience is wrong.
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