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in a related german study, researchers used fmri imaging to measure brain activity before and after injecting botox to suppress smiling muscles. the finding supported darwins theory by showing that facial feedback modifies the neural processing of emotional content in the brain in a way that helps us feel better when we smile. smiling stimulates our brain reward mechanism in a way that even chocolate -- a well-regarded pleasure inducer -- cannot match.british researchers found that one smile can generate the same level of brain stimulation as up to 2,000 bars of chocolate. (laughter) wait. the same study found that smiling is as stimulating as receiving up to 16,000 pounds sterling in cash. thats like 25 grand a smile. its not bad. and think about it this way: 25,000 times 400 -- quite a few kids out there feel like mark zuckerberg every day.and, unlike lots of chocolate, lots of smiling can actually make you healthier. smiling can help reduce the level of stress-enhancing hormones like cortisol, adrenaline and dopamine, increase the level of mood-enhancing hormones like endorphin and reduce overall blood pressure.