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