The article cited here (“Young children aged between two and four years believe that you only have to hide your head to become invisible – if your legs are on view, it doesn’t matter, you still can’t be seen”) is cool (and so unsurprising that I’m a bit surprised that it’s news), and it’s certainly psychology, but why is it characterized as “behavioral economics”? It seems cognitive (not behavioral), and I don’t see the connection to economics at all!
Maybe because it's exploring the emergence of the cognitive abilities (ability to put oneself in another's head, for instance) that underlie the behaviors studied in behavioral economics? Seems a stretch, I agree, but that's my guess.