Wikijunior:How Things Work/Timeline

< Wikijunior:How Things Work

The technology of this book spreads over a huge period of time. Here is a timeline to order the inventions.

Prehistory

13.7 billion BC - Time
2.6 million BC - Wedge

Bronze/Iron Age

3350 BC - Wheel
3000 BC - Ice Skates
2400 BC - Pulley
2000 BC - Lever
700 BC - Flush Toilet

Middle Ages

1232 - Rocket

Industrial Revolution

1801 - Light Bulb

Atomic Age

1945 - Nuclear Bomb
1952 - Laser

Post-Modern Age

1973 - Mobile Phone

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