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.
Even though most people refer to Franklin as discovering electricity, he was not the first person to discover it. In 600 BC, the Greeks discovered that when they rubbed fur on amber, it created a small electrical charger or static electricity.. In the 1600s, several physicians and scientists used the word electricity when describing some of their work, studies and inventions. Throughout time, a number of different people have had a hand at creating the electricity that most people have in their home.