If you’re a young person, six-seven might be the funniest joke you’ve ever heard. If you’re the parent of that young person, it might be the bane of your existence. But the meme is so widespread that even the head of the British government, Keir Starmer, is in on it, as he revealed in a recent visit to a primary school. Hosts Carolyn Beeler and Marco Werman have the story.