They did? > And they repeated those experiments many times over, with volunteers from 36 different countries, to see if the studies would replicate in some cul

They did? > And they repeated those experiments many times over, with volunteers from 36 different countries, to see if the studies would replicate in some cultures and contexts but not others. So different sets of people, and different researchers (the article doesn't say it, but I doubt the same researchers traveled across the globe repeatedly).