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Massive machines require engineering extremes. The massive man-made satellite, commonly known as the International Space Station, hurtling around the Earth at 27,600 km an hour, has been a temporary home for humans for the last 20 years. The biggest land vehicle on earth, a bucket excavator titled Bagger 293, that can move 240,000 cubic meters of dirt each day. Innovation has a...。The pressure to achieve more, do more, and be more is part of being human - and in the age of Adderall and Ritalin, achieving that can be as close as the local pharmacy. No longer just "a cure for excitable kids," prescription stimulants are in college classrooms, on Wall Street, in Silicon Valley...any place "the need to succeed" slams into "not enough hours in the day." But t...。