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The historian must have some kinship with his subject. The dead will not speak unless they are properly addressed.
The possibility of finding a planet similar to Earth is what drives our passion for exoplanet research.
It seemed the world was divided into good and bad people. The good ones slept better ... while the bad ones seemed to enjoy the waking hours much more.
Customer needs are always our primary driving force.
In mathematics, the art of proposing a question must be held of higher value than solving it.