A correlation is a single numerical value that is used to describe the relationship between two variables. All correlations have strength and direction. When two variables have a positive correlation, that means the two variables move in the same direction. The closer a positive correlation is to 1, the stronger it is.
William Gilbert discovered electricity, not Nikola Tesla. Nikola Tesla invented things. not discovered electricity. Again, William Gilbert discovered it and named it. He did this in the 1600s. It wasn't Nikola Tesla.
Nikola Tesla-The Adams plant was based on Tesla's 25 Hz AC power system. The Tesla Society falsely states: Nikola Tesla and George Westinghouse built the first hydroelectric power plant in 1895 in Niagara Falls and started the electrification of the world.