"Practice," she says simply before going into a little more detail. "It's a bit like going to a foreign country and being able to spot someone from your own town. How do you explain that you can tell by the way they nod their head, their gestures, that they tie their shoes the same way you learned to, that you know they must be from your village, even if you've never met."

While it does explain how she's able to do it, Njoki doesn't offer much in the way of details.