Now to get ourselves acquainted in time, this shows when archeologists, historians consider to be the main part of the Harappan Civilization. There's evidence that people had basic villages, civilizations, agriculture here as far back as 7,000 BCE. And that's just based on the evidence we have today. But when people refer to the Indus Valley Civilization in particular, they're usually starting around 3,300 BCE. And in orange right over here, this is the early period. Or you could say the early Indus Valley Civilization. Now some of the biggest structures and pieces of technology that have been discovered have been right over here which is often referred to as the mature, mature period for the Indus Valley Civilization.