| TECHNOLOGY ERAS |
| Level 0: The Stone Age (up to 4000 BC) |
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Fire, lever, language, transportation by canoe
and sledge, stone weapons |
| Level 1: The Bronze Age (4000 BC to 1200 BC) |
| |
The wheel, writing, agriculture, transport
by horses and carts, metal-tipped spears and arrows, leather armor |
| Level 2: The Iron Age (1200 BC to 500 CE) |
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Keystone arch, horseback with saddle, seagoing
galleys, scale armor, early chemistry |
| Level 3: Medieval (500 to 1450 CE) |
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Steel weapons, mathematics with zero, saddles
with stirrups, sailing ships, crossbows, chainmail |
| Level 4: Renaissance, Colonial (1450 to 1700 CE) |
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Gunpower, printing, fully-rigged ships, hot-air balloons,
muskets, sailing warships |
| Level 5: Industrial Revolution (1700 to 1900) |
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Mass production, steam power, steam ship, rail roads, dynamite,
repeating handguns, direct current power |
| Level 6: The World Wars (1900 to 1950) |
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Cars, airplanes, radios, ocean liners, submarines,
battleships, tanks, machine-guns, fighter aircraft, fission bombs, alternating
current, hydroelectric dams |
| Level 7: Modern (1951 to 2000) |
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Nuclear energy, computers, lasers, rockets, jet aircraft,
space shuttles, mag-lev monorails, hovercraft, fusion missiles, Kevlar,
organ transplant |
| Level 8: Spacefaring (2001 to 2050?) |
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Slower-than-light space travel, fusion power,
bionic implants, ballistic airliners, cybertanks, orbital lasers, cloning,
nano-technology begins |
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