Unit: Intro to PhilosophyTopic: Thales and Pythagoras contribution to philosophy. Lesson Plan: Using either a PowerPoint or via lecture, discuss with students the following "slides".Slide 1- Thales (624-548 BC). Location: Modern day Turkey. The Greeks were aware of the four elements: earth, water, air, and fire. Thales asked himself which of these took on the most forms. That's how he came up with water. When heated, water changes to steam and then to air. When frozen, it changes to a solid. I