Today, I went to Cal Tech to hear Sean Carroll, a theoretical physicist, talk about his new book From Eternity to Here. His new book is about the nature of time, the beginning of the universe, and the underlying structure of physical reality. His lecture was far ranging and covered many topics that we have discussed in theory of knowledge, including hard determinism, free will and reductionism. Sean Carroll contends that all of our explanations about reality must be compatible with the laws of physics. He believes that genuine properties, like free will, emerge out of complex systems. He also believes that their explanations must be compatible with the basic laws of nature. Below is a link to Carroll talking about his book on the Colbert Report.