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?

Viking warriors could be women.
Grave Bj 581 is a famous Viking grave.
A human and two horses were buried together.
Scientists conducted tests on the body in grave Bj 581.