Why do scientists believe that the first humans lived in Africa?

Modern humans arose in Africa at least 250,000 to 300,000 years ago, fossils and DNA reveal. But scientists have been unable to pinpoint a more specific homeland because the earliest Homo sapiens fossils are found across Africa, and ancient DNA from African fossils is scarce and not old enough.

Why did only Homo sapiens survive?

Regardless, Homo sapiens are the only humans alive, and the reason why is still a mystery. In a paper released Monday, scientists float a new explanation: The reason our ancestors avoided extinction was because they could explore and adapt. In Nature Human Behavior Patrick Roberts, Ph.
 

Is self awareness genetic?

When the authors excluded genes for human personality present in chimpanzees and then compared the two Homo species, they found that H. sapiens laid sole claim to 67 percent of the genes associated with self-awareness, 63 percent linked to self-control, and 59 percent tied to emotional reactivity.
 

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