Mersenne's Laws:
Mersenne was born in 1558 in France. His laws taught people about the frequency of vibrations of strings, like a guitar. Thicker strings make lower sounds and thinner strings make higher sounds.
Blaise Pascal was born in 1623. Pascal invented the mechanical calculator. His father became a tax collector for the King of France. Pascal's calculator could add and subtract.
Pascal was a child prodigy, gifted in math. Pascal is best known for Pascal's laws. His work spread through Mersenne's network.
Rene Descartes loved the work of Galileo and other scientists. It made him want to be a scientist too. He invented the cartesian coordinates system, which is a basis for calculus. Calculus is a form of math.
