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WORDS too much like hard work? Then relax with a feast of pictures. Hawaii is home to many species on the edge of extinction, like this lacewing captured by David Liittschwager and Susan Middleton in Remains of a Rainbow (National Geographic, £19.99). Visual recording plays a powerful part in the laboratory too. Images reveal conditions in fluids that are hard to grasp in any other way. Prizewinners such as these delicate nets of water (right), have been collected by Mo Samimy and others in A Gallery of Fluid Motion (Cambridge, £19.95).