The discovery of fire was described by Charles Darwin as “possibly the greatest ever made by man.” Archeological, dietary, and social evidence point to “continuous fire-use” at least 1.5 Mya. Fire, fueled with wood and charcoal, allowed early humans to cook their food to increase its digestibility, improving its nutrient value and broadening the number of foods that could be eaten. The cooking hypothesis proposes that the ability to cook promoted an increase in hominid brain size, though some researchers find the evidence inconclusive. Archeological evidence of hearths was dated to 790 kya; researchers believe this is likely to have intensified human socialization and may have contributed to the emergence of language. Tools were initially developed by hominids through observation and trial and error. Around 2 Mya , they learned to make the first stone tools by hammering flakes off a pebble, forming a sharp hand axe.
- Building structures became easier as technology advanced, which lead to some of the most impressive structures ever built by humans, including Stonehenge and the Egyptian Pyramids.
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- The struggling company says it has built two pickups, with a third