简介：Black holes stand at the limit of what we can know. To explore that edge of knowledge, the Event Horizon Telescope links observatories across the world to simulate an earth-sized i
简介：In 2016 filmmaker/photographer Pete McBride and writer Kevin Fedarko set out on a 750-mile journey on foot through the entire length of the Grand Canyon. More people have stood on
简介：For centuries Egyptologists have believed that the Great Pyramids of Giza were designed as tombs. But why have no bodies or treasure ever been discovered inside the pyramids? Now,
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