Germans can be grumpy, unpleasant people–and it’s not because of post-Nazi guilt or a diet filled with bratwurst, says one American researcher. It’s because of their vowels. Hope College psychology professor David Myers says saying a vowel with an umlaut forces a speaker to turn down his mouth in a frown, and may induce the sadness associated with the facial expression. Myers added that the English sounds of "e" and "ah" naturally create smile-like expressions and may induce happiness. Clearly the solution for the Germans, much like the solution for every other people in the world, is to become more like Americans. The German Embassy would not comment on the findings, saying they were "too scientific."