Blaise Pascal was born in 1623,  in Auvergne, France.  In 1642 he started working on calculating machines to help his father (who was a tax collector) more accurately and efficiently do addition and subtraction.  He is one of the two people who made a calculating machine.  Even though Pascal’s machine was invented twenty years after the first one, he gets credit because he was the one who shared his work.  He was also a mathematician, physicist, inventor, and writer.  He is most known for creating Pascal’s Law.  As states ” Pascal’s Law is a principle in fluid mechanics that states that a pressure change occurring anywhere in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere”.  I will kind of explain it.  Say you have a dam, behind it is a lake filled with water, that lake puts an amount of pressure on the dam wall.  If you remove all the water from the lake except a paper thin wall the same depth the lake was, it will put the exact same amount of pressure as that full lake did.  His work helped people at his time understand pressure and water.  Later on his work led to use in car design and hydraulic brakes were invented.  He is my favorite inventor because I feel the pressure in my ears when I swim to the bottom of a pool and now I know he explained why.