The entire human race outside of Africa owes its existence to a single tribe of around 200 people who crossed the Red Sea 70,000 years ago.
While there are 14 ancestral populations in Africa itself, just one seems to have survived outside of the continent.
The latest genetic research has shown that it was not until around 70,000 years ago that humans were able to take advantage of falling sea levels to cross into Arabia at the mouth of the Red Sea, which is now known as the Gate of Grief.
At the time the 18 mile gap between the continents would have dropped to just 8 miles. It is not clear how they might have made such a journey but once a cross, the humans were able to spread along the Arabian coast where fresh water springs helped support them.