- Calculus is the mathematical study of continuous change, in the same way that geometry is the study of shape, and algebra is the study of generalizations of arithmetic operations.
- Bartolomeo Cristofori (Wikipedia)
Bartolomeo Cristofori di Francesco (Italian pronunciation: [bartoloˈmɛːo kriˈstɔːfori di franˈtʃesko]; May 4, 1655 – January 27, 1731) was an Italian maker of musical instruments famous for inventing the piano.