In the May 12 SN: Rules of animal fight club, an exoplanet cookbook, a Bronze Age engineering mystery, bowhead whale jams, NASA's new planet hunter, the neurogenesis debate continues and more.

REALLY REAL The mathematical ideal of real numbers might not appropriately represent the reality of the real world, says physicist Nicolas Gisin.

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MATH GETS REAL Chaos theory explains why it’s so difficult to predict weather — a small change in conditions at any point in time can have a large effect on future conditions in, for example, a hurricane’s trajectory (Tropical Storm Harvey shown).

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NOT PIOUS Pi, the ratio of a circle’s circumference to its diameter, is revered as an all-important number in mathematics. But some are starting to question that devotion.