The Groen van Prinstererlyceum, which first trialled happiness lessons a decade ago, teaches some of the least troubled teens in the world.
Senay Boztas, Guardian, Why Dutch teenagers are among the happiest in the world 17 June 2018.
I’ve been seeing this new construction a lot lately, on both sides of the Atlantic: trialled. I guess it means “subjected to a trial”. Or, in other words, tried. Ugh.