I was watching a documentary about the Super Volcano Toba and they explained that as few as 2,000 people worldwide survived the explosion 75,000 years ago.
Now, it wasn't a week later while watching another documentary that I saw a female archaeologist excavating a human site in Indonesia that was just above the volcano ash layer...to soon for another group to walk from Africa.
I understand that these people could have (somehow) gone extinct...But, I don't think so. Something is going on with the DNA that we don't understand....and then, there's Mungo Man in Australia.