The strange paradoxes and puzzles of the quantum behaviour of black holes and the things that fall into them led to a spirited battle of ideas between Stephen Hawking, Leonard Susskind and other scientists. Resolving the debate may change our entire understanding of space, time, matter and information – is the entire world, for example, a quantum hologram? black hole, Leonard Susskind, space-time, Einstein, Hawking, complementarity, uncertainty principle, holographic principle, string theory,