Richard Dawkin's "The selfish gene", and "The blind watchmaker". Profoundly impacted and reinforced my thinking about God and religion. "Atlas Shrugged", while very verbose, the utopia it presented was exciting and some aspects of such meritocratic community has rubbed off. Immensely helped with shedding many biases, and focus on ability, specifically in the workplace. I also think it somehow made me less empathetic.