The Mayans originated in Central America, migrating from Asia during the last Ice Age. They had a complex religious system that involved sacrificing humans and animals to appease various gods. The Mayans developed an accurate calendar and understood astronomy, mapping the movements of celestial bodies. They built elaborate cities and pyramid temples precisely oriented based on astronomical observations. The Mayans also had an advanced mathematical system that included the concept of zero. Their art incorporated stone carvings, pottery, and paintings. A dangerous ball game called Pok-a-Tok was played for religious and political purposes, sometimes with the losers being sacrificed.