Thomas Nagel Thomas Nagel

All of our scientific tools have limits. These limits ensure that we will never see the whole picture. We can never have complete knowledge of the universe. Above, the ESO's APEX radio telescope probes the heavens from its lonely perch on Chile's Chajnantor plateau. Gordon Gillet/ESO hide caption

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Gordon Gillet/ESO

Could North Korea be behind commentator Alva Noë's car problems? Not likely. Just as it's not likely a theory of everything will ever explain human behavior. Ed Jones/AFP/Getty Images hide caption

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Ed Jones/AFP/Getty Images

How does our subjective reality emerge from the physical structures of the brain and body? iStockphoto.com hide caption

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iStockphoto.com