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.

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What are ostrich pillows? Which incident led to the invention of the slinky? What are Hamblin Glasses? Have scarves always been a fashion statement?

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A fascinating leveled nonfiction reader some of mankind's most

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