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SIZE is all. That is, if you join Philip and Phylis Morrison in considering the relative size of things in the Universe. In Powers of Ten (Scientific American Library/W. H. Freeman, pp 160, $19.95), you travel from the “breathtakingly vast to the extraordinarily small”, each scene taken at a different power of ten magnification. First published in 1982, the photographs still have a power to amaze. The series of pictures show a journey through the skin of a hand down to and below cellular level to where strands of DNA appear pink and fluffy (right). They then take you out into the Universe, where the stars coalesce into similar fluffy looking galaxies. A flicker book for the curious, the images appear with a thoughtful text that began as a film by American designers Charles and Ray Eames. W. H. Freeman in New York also sell a video of Powers of Ten.