The researchers overcame problems that have plagued previous studies - that of contamination. All living things have DNA and examining archeaological finds always leads to investigators DNA being left on the finds. Danish researchers planned this excavation carefully. They took samples from teeth and bones for DNA testing moments after the ancient skeletons were first unearthed, before any DNA could contaminated the area.
Tests on DNA that can still be extracted from the tissue that remains on ancient skeletons can tell us a lot about how ancient civilisations operated. DNA testing of Viking remains can provide important information about how genetic disease originated and have developed over time, how our ancestors migrated and what sort of society and culture they lived in.