Does human knowledge have limits? In a time when science seems to unveil the deepest mysteries of the physical world, is there anything we can never explain or understand? In What We Can not Know, Marcus du Sautoy explores seven confines of knowledge to answer the questions posed: will we ever be able to determine what consciousness is, reveal the nature of time, understand the paradoxes of quantum mechanics, glimpse the future of the universe or understand if the infinite is a real entity or just an abstract concept? With the expository clarity and ingenuity that characterize him, Du Sautoy guides us on this fantastic voyage of exploration of the unknown: it is very likely that we will never know everything, but from the author's hand we discover that the infinite race towards an unattainable goal it is precisely what drives scientific research and stimulates our thirst for knowledge.