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Mammals win by a nose: Sense of smell drove evolution of big brains

• Washington Post
200 million years ago, a keen sense of smell drove an explosive growth in brain size that pushed mammals out from under the shadow of dinosaurs, a new study concludes.
Enhanced smell probably gave the first mammals — tiny shrewlike critters — the ability to sniff out insects and grubs at night while allowing them to avoid being eaten by stinky dinosaurs, the study authors suggest.

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