Harvard Magazine has an interesting article that investigates the transition of Britain from Romans & Celts to Anglo-Saxons in a 400 year period.
The article is about scientific disciplines helping fill in the gaps in the written record of historical times. The findings of science are informing revised interpretations of evidence.
One example is the black earth where the towns of France were thought to have been abandoned after the fall of the Roman Empire, but actually show a change in building materials from stone to organic materials such as wood and thatched roofs.
They also tie the DNA study into examples from the descendants of the former slaves in the US, and the population of Medellin, Columbia. This can add flavor to the history and sway of one’s campaign.
It is amazing how little things we do not expect can inform us and help add spice to a campaign.