Maria Montessori quotes (Italian Physician and Educator. 1870-1952)
Albert Einstein quotes (German born American Physicist who developed the special and general theories of relativity. Nobel Prize for Physics in 1921. 1879-1955)
William Bragg, Sr. quotes
Dr. Carl Sagan quotes (American Astronomer, Writer and Scientist, 1934-1996)
Immanuel Kant quotes (German Philosopher one of the foremost thinkers of the Enlightenment. 1724-1804)