Three main components are needed for fire. The exact timing of the discovery and use of fire by humans has been a subject of continuing research, yet perhaps two questions have, until now, received little attention: What was fire on Earth like before humans appeared? And what experience of fire could early humans have had? The use of fire by humans has long been considered as a defining property of intelligence, separating us from other animals. Fire is one of the most important forces on Earth.
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