The birth of the universe, and the origin of all creation - Humans invented tools, discovered fire and painted murals in dark caves. Murals were created on a mission to pass down stories and history to posterity. From murals, we could tell that the discovery of fire was a highly important turning point for ancient humans. Now it's time for us, humans, to reconsider energy. When I have a look back in history and imagine the life style of ancient humans, I always feel grateful for what we have now in our modern civilization.