When you think of smiling, you usually equate it with happiness. While that's often the case, it isn't always; people have been known to smile for other reasons as well. Perhaps the second most common reason to smile is to fake happiness, with smiling out of frustration coming in third. As a person, you're usually able to suss out the meaning behind a smile by looking at it in context of the moment in which it happened, but given a single image, your accuracy goes way down. New smile-tech from MIT, however, excels at figuring out the story behind the snapshots.
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