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There are many, many things that nobody knows. Do animals have a sense of humor? Why do we have five fingers? What did Jesus do in his youth? Has human evolution stopped? Can robots become self-aware? What goes on inside a black hole? Bringing together The Things That Nobody Knows and Even More Things That Nobody Knows, this bumper volume takes us on a guided tour of 1,001 gaps in our knowledge of cosmology, mathematics, animal behavior, medical science, music, art and literature.