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How did the universe actually begin? “If the universe is infinite, it has been infinite since the very beginning," a researcher answers.
how general relativity and the discovery of cosmic expansion pointed to a beginning of the universe, including Einstein's cosmological constant and why some astronomers resisted the idea
The traditional Inca chronology has collapsed. New radiocarbon dates show the empire lasted longer than was previously thought -- and met more resistance
A circular hole in a 75,000-year-old scapula suggests lethal conflict involving sharpened wooden spears among Neanderthals in the Middle East.
