What is the biggest number? Is the universe infinite? How did the universe begin? Might every event repeat again and again and again and again... Is the Earth just one of uncountable copies, tumbling through an unending void? Your intuition is no use here. Faith alone can't save you.Mathematicians have discovered there are infinitely many infinities, each one infinitely bigger than the last. And if the universe goes on forever, the consequences are even more bizarre. In an infinite universe, there are infinitely many copies of the Earth and infinitely many copies of you. Older than time, bigger than the universe and stranger than fiction. This is the story of infinity.