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Life sciences/Evolutionary biology/Evolution/Brain evolution

The findings suggest that the direction of the mental number line may have deep biological roots.

A rose by any other name would smell as sweet; the saying is perhaps a testament to the acute sense of smell that is unique to mammals. Paleontologists have now discovered that an improved sense of smell jump-started brain evolution in the ancestral cousins of present-day mammals. The research appears in the 20 May issue of the journal Science.