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Reef diving is spectacular.
History, too, draws curious travelers to explore the region. Much of what the Spanish conquistadors found on the peninsula in the 1500s is still here, unchanged. Hidden Cancun and Yucatan by Richard Harris 16. When Computers Exceed Human Intelligence - if Ray Kurzweil is right, we've only got until about 2020 before computers outpace the human brain in computational power. Kurzweil, artificial intelligence expert and author of The Age of Intelligent Machines, shows that technological evolution moves at an exponential pace.