Title: Buddhism.
Question: Who taught directly or indirectly to all other Buddhas?

Title: Age of Enlightenment.
Question: Marmontel contrasted "the opinion of men of letters" with what?

Title: Infrared.
Question: What equations are used to figure out the index of refraction and extinction Coefficient?

Title: Southern Europe.
Question:
What was the name of the different governments forming in Ancient Greece?