<prompt> Translate the following text to EnglishKatika miaka ya 1970, Ekman alianzisha mfumo wa Facial Action Coding System FACS ambao ulitumia kupima mwendo wa uso unaoonekana kwa macho.  <response>: During the 1970s, Ekman developed a method called the Facial Action Coding System FACS to measure all visually discernible facial movement. 