There are many, many things that nobody knows. Do animals have a sense of humour? 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 1001 gaps in our knowledge of cosmology, mathematics, animal behaviour, medical science, music, art and literature.