Before I get to the answer, perhaps we’ll start with another question: are you familiar with Archimedes? He possessed one of the greatest minds in ancient Greece. He was a polymath and excelled in mathematics, physics, astronomy, and philosophy. He discovered some of the foundational principles of density, optics, and perhaps most notably, leverage. With regards to this last subject, Archimedes said,
“Give me a lever long enough and a fulcrum on which to place it, and I shall move the world.”
A lever is a simple device that consists of a long bar or plank that rotates about a fixed point, known as a fulcrum.