I enjoyed learning about moais, but the Blue Zone quiz at the end of the article was a complete non-sequitir for me.

I like the simple litmus test that wizardforhire mentioned (https://news.ycombinator.com/item?id=17544755). Another one I like is WaitButWhy's "Traffic Test":

"The Traffic Test is passed when I’m finishing up a hangout with someone and one of us is driving the other back home or back to their car, and I find myself rooting for traffic. That’s how much I’m enjoying the time with them."

(from https://waitbutwhy.com/2014/02/pick-life-partner-part-2.html)