Our ability to use the thumb against the four fingers is what distinguishes us from the lower primates, who just do not get the right-hand rule. There are cave drawings of motors and generators that were doomed to failure since those cave dwellers were curving all five fingers. Then the right-hand rule was invented. It is an invention that matches the wheel and fire in significance and after that there was no stopping us.Just to be fun.. Don't take it serious
– From CHAPTER 10 Ampère II, Faraday, and Lenz of Shanker's Fundamentals of Physics II.