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Mathematicians Open a New Front on an Ancient Number Problem
By STEVE NADIS
For millennia, mathematicians have wondered whether odd perfect numbers exist, establishing an extraordinary list of restrictions for the hypothetical objects in the process. Insight on this question could come from studying the next best things.
How Two Became One: Origins of a Mysterious Symbiosis Found
By VIVIANE CALLIER
Carpenter ants need endosymbiotic bacteria to guide the early development of their embryos. New work has reconstructed how this deep partnership evolved.
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