The Stories Behind 20 Inventions That …
https://www.mentalfloss.com/article/648542/inventions-changed-world
The Stories Behind 20 Inventions That Changed the World Suspension Bridges Toilets The Walkman The Pill Super Soaker The Blood Bank Space Telescopes The Pizza Box and Pizza Table Vaccinations Toothbrush Air conditioner Three position traffic lights Zipper Flat bottomed paper bag Syringe Headphones 1. Suspension Bridges Marti Bug Catcher (bridge) // Shutterstock; Julia Lemba (background) // iStock via Getty Images Plus ... Vaccinations When was it invented: 1796 ... Toothbrush When was it invented: Boar bristles in 1498, modern day nylon tooth brush in 1938 ... Air conditioner When was it invented: 1902 ... Three position traffic lights When was it invented: 1920 ...
Suspension Bridges
Toilets
The Walkman
The Pill
Super Soaker
The Blood Bank
Space Telescopes
The Pizza Box and Pizza Table
Vaccinations
Toothbrush
Air conditioner
Three position traffic lights
Zipper
Flat bottomed paper bag
Syringe
Headphones
1. Suspension Bridges Marti Bug Catcher (bridge) // Shutterstock; Julia Lemba (background) // iStock via Getty Images Plus ...
Vaccinations When was it invented: 1796 ...
Toothbrush When was it invented: Boar bristles in 1498, modern day nylon tooth brush in 1938 ...
Air conditioner When was it invented: 1902 ...
Three position traffic lights When was it invented: 1920 ...
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