I don't understand exactly which information you are asking for proof, if you are talking about the part about Homo sapiens, they first appeared in Africa, it is thought to have spread all over the world from there, you can easily find it with a simple search on the internet.
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Better documented posts deserve a better curation. Also, you're reader may feel more confident about what you're saying if they see a reputable source where they can check out the fun facts and maybe learn more.