The science-fiction aspect of the film revolves around the ability to reverse the entropy of things and people, resulting in time reversibility. While the film does refer to real concepts from physics, among them annihilation, the second law of thermodynamics, Maxwell's demon, the grandfather paradox, and Feynman and Wheeler 's Absorber Theory, Nolan stated that "we're not going to make any case for this being scientifically accurate". Commenting on the scientific aspects of writing the script, he stated: "I think the scientific method is the best tool we have for analyzing and understanding the world around us... I've been very inspired by working with great scientists like Kip Thorne, who I worked with on Interstellar, who also helped me out with some early analysis of the ideas I wanted to explore to do with time and quantum physics on Tenet, although I promised him I wasn't going to bandy his name around as if there was some kind of scientific reality to Tenet. It's a very different kettle of fish to Interstellar."