Psychology Today - December 2018
"Insights" - "Are Suspicious People Smarter?" and "Vulnerable Moments"
page 11 & 23
There are 2 articles in an American magazine, in the same section, that include a look at what Germans say, each article with a different author.
The first is statistics and/or an opinionated report from Germany. It's about people in general, about how intelligence and pessimism relate.
The second is recent German university students. It's about what they think about showing vulnerability, in life situations, in general.