Smiling, as it turns out, has truly remarkable effects. First, doing it actually makes you feel good even if you're not feeling good in the moment. Research demonstrates that when we smile, we look better to others. Not only are we perceived as more likable and courteous, but those who benefit from our sunny grins actually see us as more competent (something to keep in mind while giving presentations or interacting in the office). The brain's happiness circuitry is activated when you smile (regardless of your current mood). If you're down, smiling actually prompts your brain to produce feel-good hormones, giving credence to the adage, "fake it til you make it" when it comes to your state of mind.