The aurora borealis is usually seen near the Arctic, but solar winds and magnetic turbulence are sparking some of the best light shows in centuries throughout the US.
This persnickety number determines the strength of magnetic fields. It figures in everything from motors and generators to audio speakers. Oh, and without it weβd live in eternal darkness.
The force between electrical charges is kind of a big dealβwithout it, the universe would be a primordial soup, and you would not exist. That force is determined by the electric constant.