Read the passage.
Researchers in Sweden decided to conduct testing on an individual buried in a famous Viking grave. The grave is known as Bj 581. This grave contains a single human, two horses, and weapons. Scientists reexamined the body in 1970. They studied the shape of the hips. The shape seemed to be female. This claim stirred up a controversy. Could Viking warriors be women? In 2017, scientist Charlotte Hedenstierna-Jonson analyzed ancient DNA from Bj 581. The results were conclusive. The Viking in the grave was female.
What is the central idea of the passage?