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  1. 19708

    On this article, real cats do this too. I have observed many adult cats teaching kittens (not necessarily theirs) to hunt. People who receive “presents” from their cats are not being gifted. The cats are trying to teach them how to hunt, but the cats probably think we are pretty dumb. Emily JohnstonWestminster, Md.

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  2. Astronomy

    Explosive Aftermath: Sluggish neutron star puzzles astronomers

    An X-ray–emitting object at the heart of a young supernova remnant doesn't fit the textbook view of what a stellar explosion is supposed to leave behind.

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  3. Humans

    Close Your Books: Cuts, shutdowns loom for EPA libraries

    Some regional libraries maintained by the Environmental Protection Agency will permanently shut their doors because of a proposed cut to their funding.