What sage said and add
fiber optics,
cool gate (I am currently getting a frosted glass gate for back yard).
I was itching last week as I climbed up in the attic for adjusting and adding fiber glass insulation.
I read a book not so long ago called Pillars of the Earth about a builder of cathedrals who used vast expanses of colored glass (stained glass) that was to make people feel emotional when they entered the churches.
EXRA ordinary
You could see from the inside to the outside of your house.
Correct problems with the eyes.
See farther into space.
More sanitary drinking vessels.
Television tubes and all vacuum tubes.
Touch screens.
Laboratory equipment.
Thermometers and other instruments.
Prisms for color separation.
Cooking utensils
