I learned about three inventions and one inventor. The three inventions are Mersenne’s Law, Cartesian Coordinates, and Mechanical Calculator. The inventor’s name is Blaise Pascal. The first invention I learned is Mersenne’s Law. His laws tell how to tune a string instrument. Mersenne established the science of acoustics. The second invention I learned about is Cartesian Coordinates.  His Coordinate System allows the plotting of geometric shapes in algebraic notation 2x + 2x = 4. The Cartesian Coordinate System was vital for calculus. The third invention I learned about is the Mechanical Calculator. A mechanical calculator is a mechanical device used to automatically perform the basic operations of arithmetic. The first commercial success arose in 1851 and they were produced until the 1970s. Lastly, I learned about Blaise Pascal. He investigated the concept of the vacuum and he got involved with experiments associated with the invention of the barometer. He was an important contributor to science and his law produced important inventions.