Monday 25 June 2018
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cnn.com
12 days ago

How many types of smile are there?

In the mid 19th century, French neurologist Guillaume Duchenne wanted to distinguish real smiles from fake. Interested in the response of nerves and muscles to stimulation, he applied electricity to particular parts of faces to see the results.

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هذه الصفحة هي مجرد قاریء تلقائي للأخبار باستخدام خدمة الـ RSS و بأن نشر هذه الأخبار هنا لاتعني تأییدها علی الإطلاق.
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