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DISCLAIMER:
In 1983, Josef Scheppach started an article dealing with the phenomenon of laughter with these words: »It's really not ridiculous: We Germans lose our humor! We laugh only 6 minutes a day. Forty years ago it was 18 minutes at least by the way at a time that has been less funny in every respect!« This observation has been published in P.M., a (popular) scientific magazine.
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