Harvard University

The prestigious Ivy League university in Cambridge, Massachusetts, said in a news release that Ms Ardern had been appointed to dual fellowships.

Ms Ardern served as prime minister of New Zealand for more than five years.

She announced she was resigning from public office in January, saying she did not have "enough in the tank".

On Tuesday, Harvard announced that Ms Ardern would be joining their campus in the autumn under dual fellowships at the Harvard Kennedy School.

Sure, hundreds of millions of players were wandering around, eyes glued to smartphones, putting their energies into "catching" imaginary creatures in the augmented reality game.

And yes, okay, maybe the quest to "catch 'em all" meant they occasionally strayed into less-than-appropriate locations. Like Holocaust museums.

To test it, she divided 84 female room attendants (hotel maids) from seven different hotels, into one of two groups.

In a study about "health and happiness in the workplace," the informed group received information about the benefits of exercise, and were informed that their housekeeping work satisfied the CDC's recommendations for an active lifestyle (at least 30 minutes of physical exercise per day).