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Forcing a Smile Using Electrical Stimulation Can Boost Your Mood
New Research Reveals That Dolphins “Smile” To Signal for Playtime
Study: Bottlenose Dolphins ‘Smile’ at Each Other during Their Playful Interactions
Bottlenose dolphins 'smile' at each other while playing
Bottlenose dolphins “smile” at each other while playing - EurekAlert
Robots Get a Fleshy Face (and a Smile) in New Research
