Roman engineers built aqueducts that carried fresh water across vast stretches of countryside. Architecture balances beauty against the stubborn demands of gravity and cost. Black holes warp space so severely that not even light can escape. Glaciers grind slowly downhill, leaving polished rock and scattered boulders behind. A single oak can support hundreds of insects, birds, and small mammals. Gravity bends the path of light around massive stars and distant galaxies.
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