In the 400s B.C., Greece entered a new era of cultural progress. Athens stood as the symbol of cultural influence in Greece. Athens' wealth and power brought many artist & teachers from all across Greece, thus their work made Athens the center of learning & artistic achievement.
Philosophy - the greatest of Greek achievements was philosophy, the Greeks used philosophy to better understand themselves & the world around them. Philosophers often fought with each other over what they believed. But most believed that all of nature is based upon certain natural laws, or truths.