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The light of the sun - the source of life and a god in ancient times - was always associated with warmth or even burning heat. When man learnt to tame fire, he had another source of light, which was also hot. All the more puzzling for the amazed observer has been the dance of fireflies glimmering in the dark. How can an animal emit light? Or what about the faint glow of walls in some pre historic tombs due to luminescent bacteria? This sort of "cold light" is known today as chemiluminescence. A related phenomenon is the aurora borealis with its swiftly moving curtains oflight. This is a...