The last two decades have seen a revolution in scientists' ability to reconstruct the past. This has been made possible through technological advances in the way DNA is extracted from ancient bones and analyzed.
These advances have revealed that Neanderthals and modern humans interbred — something that wasn't previously thought to have happened. It has allowed researchers to disentangle the various migrations that shaped modern people. It has also allowed teams to sequence the genomes of extinct animals, such as the mammoth, and extinct agents of disease, such as defunct strains of plague.
