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.
While Thomas Edison and Edward H. Johnson may have been the first to create electric strands of light in 1880/1882, it was Albert Sadacca who saw a future in selling electric Christmas lights.hile Thomas Edison and Edward H. Johnson may have been the first to create electric strands of light in 1880/1882, it was Albert Sadacca who saw a future in selling electric Christmas lights.