"After graduating from high school, I hesitated between pursuing a career as a documentary filmmaker or a physicist. But I had to decide: Did I want to impart knowledge or create it? In the end, science won out." At least temporarily – because Kathrin, being Kathrin, wasn't about to give up on either one of her passions. However, while at university she took part in a three-month research project in Paris. Three floors below the Mona Lisa, in the basement of the Louvre, she investigated Stone Age jewelry. Were the shells deliberately dyed, making them the first pieces in a consciously designed jewelry set? Or did they turn black by accident? Kathrin worked with a team of archeologists, using comprehensive characterization methods to uncover the answers. And ultimately identified the jewelry that our ancestors wore some 10,000 years ago.