by 1930, 9 out of 10 American buildings had one.
by 1960, 9 out of 10 American homes had one.
The personal computer was invented in 1965...
by 2010, almost 8 out of 10 American homes had one.
The first commercially available solar panels were available in 1959...
by 2014, almost 1 out of every 500 American homes has one.
Enjoy the journey!
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