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Why do some smells repel us more than others … and why do some immediately trigger a memory? How does our sense of smell interact with other senses, like hearing and sight? Why does an older woman, if her sense of smell grows less acute, have a smaller social circle -- but the same is not true of older men? We talk about all that and more with Johan Lundstrom, a cognitive psychologist who does research at the Monell Chemical Sense Center in Philadelphia and the Karolinska Institutet in Stockholm, Sweden. Original air date: 7.17.17

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