Specifically, researchers split 114 students into two groups to answer maths questions from the Graduate Management Admission Test (GMAT). One group was exposed to a coffee smell during the test, and ended up with "significantly higher" scores. What's more, based on questions asked during the test, just smelling the beverage seemed to boost students' expectations for how well they would do.

— Read more at Even Just The Smell of Coffee Could Actually Perk Up Your Brain, Study Shows at Science Alert.