What sparked the exodus of early humans from Africa?

Credit: John S. Dykes
Credit: John S. Dykes

Why, exactly, did our ancestors leave their homeland? Short of catching a time machine back some 60,000 years and witnessing our ancestors on the plains of Africa, we may never know for sure. As a result, we must find satisfaction in the answers that circumstantial evidence can provide.

Climate change is one of the most commonly cited forces affecting why humans left Africa. The reasoning goes like this: We humans thrive in a climate that has plentiful rainfall. Rainfall governs the growth of plants, and plants govern the density and diversity of large herbivores that our ancestors would have relied upon for food. Any significant changes to this system (you might imagine) would lead to our ancestors packing up their homes.

Follow the latest news and policy debates on agricultural biotech and biomedicine? Subscribe to our newsletter.

According to researchers who modeled patterns of migration waves, there’s no need to look beyond human behavior to understand why we left Africa. We simply formed populations based on shared traits, maintained regional boundaries, and migrated spontaneously for any number of reasons.

Where there are dense populations of humans, there is a higher chance of spontaneous migration occurring. Given that Africa bore the largest density of humans, it was from Africa that humans would disperse — without any invocation of weather or food — to seed humankind to the rest of the world. 

Read the original post

Related article:  Fecal transplant industry needs a lot of 'quality' poop. Where does it come from?
Outbreak Daily Digest
Biotech Facts & Fallacies
Genetics Unzipped
Infographic: How dangerous COVID mutant strains develop

Infographic: How dangerous COVID mutant strains develop

Sometime in 2019, probably in China, SARS CoV-2 figured out a way to interact with a specific "spike" on the ...

Philip Njemanze: Leading African anti-GMO activist claims Gates Foundation destroying Nigeria

Nigerian anti-GMO activist, physician, and inventor pushes anti-gay and anti-GMO ...

Most Popular

News on human & agricultural genetics and biotechnology delivered to your inbox.
glp menu logo outlined

Newsletter Subscription

Optional. Mail on special occasions.
Send this to a friend