Wikijunior:How Things Work/Timeline

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

 * 1790 - Sewing machine
 * 1801 - Light Bulb

Atomic Age

 * 1945 - Nuclear Bomb
 * 1952 - Laser

Post-Modern Age

 * 1973 - Mobile Phone