File:Guillaume Duchenne de Boulogne performing facial electrostimulus experiments (2).jpg
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![File:Guillaume Duchenne de Boulogne performing facial electrostimulus experiments (2).jpg](https://upload.wikimedia.org/wikipedia/commons/thumb/e/e2/Guillaume_Duchenne_de_Boulogne_performing_facial_electrostimulus_experiments_%282%29.jpg/433px-Guillaume_Duchenne_de_Boulogne_performing_facial_electrostimulus_experiments_%282%29.jpg?20050901215805)
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