Here are some of the coolest things Israeli researchers have sniffed out about the underappreciated sense of smell.

BALTIMORE -- What's that smell? Baltimore-area residents are trying to figure out what that not-so-pleasant stench was on Wednesday morning. "I was like, 'Wow, it smells like poop out here,'" Hampden ...

Once there, it decides if that particular smell is pleasant, repulsive, or simply neutral. Somebody who knows a lot about that process is Professor Krishna Persaud from the University of Manchester.

Activation patterns in the amygdala in response to pleasant smells. (A to D) Brain scans showing activation patterns. Histograms showing Shapley values of experimental participants. (E ...