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“The trustworthiness of science comes not from certainty, but from its very openness about its uncertainty, always calling into question what we currently understand and being prepared to replace that knowledge with a deeper understanding if something better comes along. In other walks of life, this attitude might be regarded as fickle. But not in science. Scientific progress depends on scientists' unwavering commitment to the qualities of honesty and doubt.”
― Jim Al-Khalili, The World According to Physics

“By thinking about what we don't yet know, we can think about how we can best find out. It is the many questions we have asked over the course of our human history that have given us an ever-more-accurate picture of the world we know and love.”
― Jim Al-Khalili, The World According to Physics

“Let me first make two important assumptions, which I will discuss in more detail later on, but will now just say that they are both supported strongly by observational evidence: (1) that the laws of physics are the same everywhere in our universe, and (2) that space looks the same in all directions (the same density and distribution of galaxies).”
― Jim Al-Khalili, The World According to Physics