One of the greatest frontiers of the 21st century does not lie far beyond us but deep within us. If you think the secrets of the universe are dazzling, just wait until you explore the ones hidden inside your own head. In the 1960s, when human beings were first venturing into outer space, TIME explored those efforts and traveled with astronauts, through launches from Sputnik to Apollo and far beyond. Humanity is on a similar quest now, inward rather than outward, and just as readers decades ago came to count on us for news from the cosmos, so can today's readers look...
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