Nearly 50 years ago it was discovered that the fundamental particles, such as the electron and proton, have left-handed' interactions - they do not respect mirror symmetry. This experimental fact motivates the idea that a set of mirror particles' exist. The left-handedness of the ordinary particles can then be balanced by the right-handedness of the mirror particles. In this way mirror reflection symmetry can exist but requires something profoundly new. It requires the existence of a completely new form of matter called mirror matter'. Remarkably the mirror matter theory is capable of simply...