1 Humans probably picked up burning branches when lightning caused fires. They kept fire going by setting fire to other sticks. The oldest traces of the use of fire have been found in China. They date back 600,000 years.
文摘1 Humans probably picked up burning branches when lightning caused fires. They kept fire going by setting fire to other sticks. The oldest traces of the use of fire have been found in China. They date back 600,000 years.