Ben Franklin invented bifocals in 1785.
Other "vision" technologies since then have given us a much clearer view of the whole universe.
Supercool Space Tools
A long time ago, people looked into the dark night sky and wondered about the stars, meteors, comets and planets they saw. The only tools they had to study space were their eyes and their imaginations. They had no other tools to help them learn what these lights in the sky really were.
This little picture book tells about the inventions throughout history that have helped us understand the universe better.