20 inventions that changed the world

From the wheel 5,500 years ago to the birth control pill, these 20 inventions had huge ramifications and have helped humans shape the world around us.

The 20 Greatest Inventions of All Time

Great 20th Century Inventions From 1900 to 1949

A fascinating leveled nonfiction reader some of mankind's most

10 Medieval Inventions that Changed the World

Inventions of the 20th Century by Katherine Sandheinrich

20 German inventions that changed the world!

20 Australian inventions that changed the world - Australian

Why Didn't I Think of That? Book by Anthony Rubino Jr

Top 20 greatest inventions of all time - Big Think

Inventions That Changed the World - Wikipedia

Describes inventions in such categories as medicine, entertainment, and war, illustrating how they work and how they transform everday lives.

Inventions That Changed the World (The Eventful 20th Century, 4)