< 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
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
- 1790 - Sewing machine
 - 1801 - Light Bulb
 
Atomic Age
- 1945 - Nuclear Bomb
 - 1952 - Laser
 
Post-Modern Age
- 1973 - Mobile Phone
 
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