Hints: They are sisters. They lived to be 30 to 40 years old… more than 6,000 years ago. And these are not photos.

Answer: What you’re looking at is 3-D reconstructions of two adult sisters who lived and worked in a brutal mining community in what is now the Czech Republic. The stunning reconstructions are based on a new analysis of the sisters’ remains, which were unearthed more than 15 years ago from a prehistoric chert mine in the South Moravian region. According to a study published in the June 18 journal Archeological and Anthropological Sciences, new evidence suggests that the sisters worked in the mine, extracting heavy rocks to be used as tools and weapons.