Question 1: What was happening with the climate 200,000 years ago when the first Homo sapiens are seen in Africa?
Question 2: The bottleneck effect has affected humans; why do we know we were subject to a bottleneck? When was this bottleneck, and how long ago? How many humans were left after the bottleneck, in other words, what was the size of our original population?
Question 3: When did Homo sapiens start leaving out of Africa?
Question 4: How many different species were there in the world when our ancestors were leaving Africa?
In other words, we were not alone as a single species, who else might we have encountered?