Radio: 38
TV: 13
Computer: 4
1984: 1,000
1992: 1 million
2006: 600 million
1848 wagon train: 5 to 6 months
1920 train: 3 days
2009 jet plane: about 5 hours
Humans have been evolving on Earth for around several million years, but it only took 66 years to go from the Wright brothers' flight (1903, above) to the Apollo 11 mission that put a man on the moon (1969, right).
Sources: "Shift Happens," by Karl Fisch; www.geocities.com; www.nasa.gov
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