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  1. Message Songs: Wild gibbons warble with a simple syntax

    Gibbons, a line of apes in southeastern Asia, rearrange their songs in order to communicate with one another.

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  2. Astronomy

    Rocky Finding: Evidence of extrasolar asteroid belt

    Astronomers have obtained some of the best evidence yet for an asteroid belt beyond the solar system.

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  3. 19777

    At least on Earth, rock impacts result in charging of the particles. In space, wouldn’t this have a great effect on the motion of the rocks? Stuart HoenigTucson, Ariz. According to researchers, it’s true that the electrostatic charging of space dust and rocks may affect the motions of small particles. However, little is known about […]

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  4. Math

    Laying Track

    Switches in train track layouts lead to a tangled math problem.