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WHEN asked what was the most stunning discovery of the 20th century, the German quantum physicist Werner Heisenberg was in little doubt. In his view, it was the prediction and discovery of antimatter in the 1930s. It was as if a magic mirror had been held up to the Universe. In it, we could see antimatter particles, each one related to a particle in the matter world, but with many properties inverted or reflected. What’s more, if a matter particle approached and met its “reflection”, something incredible happened-all the inverted properties cancelled and the pair vanished in an intense flash…