Socrates. You think your teacher is tough when he or she asks a question? Socrates almost never gave a straight answer. A question was always followed by another question. He's fun to read about, but I'll bet his students didn't always like it.
They extended usable hours of the day
Transformation in thinking that occurred in the 1500's and 1600's caused by scientific observation, experimentation, and questioning of traditional opinions. It changed the way Europeans looked at the world. What did the Greek astronomer Ptolemy believe? He believed the Earth was the center of the universe.