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The first bones that they discovered dated back to 2 million years ago. They then later found bones from 3 million years, they had enough of those bones to put together a full skeleton which they named Lucy.
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Archeologists believe that the first stone tools were created about 2.6 millions years ago. Archeologists have not figured out which group of hominids made them.
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They emerged 250,000 years ago and 100,000 years ago. They developed after the Homo eructus disappeared. Homo sapiens are the modern humans today.
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The Neolithic Revolution happened 12,000 years ago. It was the change from the people being hunters and gathers, to settling in villages and farming developed.