Photo Credits: Albert Einstein; Microsoft Chairamn Bill Gates at 1999 Comdex convention photos courtesy Associated Press

Top 10 breakthroughs of the 20th century Computers smaller, stronger, faster U. of Chicago has produced 70 Nobels Medical milestones Cloning evokes excitement and ethical questions Arthur C. Clarke: A lifelong space odyssey Early space missions were engineer's dream NASA sets sights on different horizons We've learned from the century's major disasters 20th century forever altered by atomic bomb Fermi's feat initiated the modern nuclear age Voices of Marx, Darwin and Freud resonate

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