Asteroid Itokawa is a Pile of Rubble

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Data from Japanese space probe Hayabusa's mission to the asteroid Itokawa show it is made up of rubble and boulders rather than solid rock, giving rise to the new field of microgravity geology. Crocodiles roamed the temperate rainforests in the Arctic, 55 million years ago, when there was a super-greenhouse effect. How does a group of locusts turn into a swarm with one apparent mind and cause a plague? High-tech sailing boat design.