And for me, it's quite romantic, but it's about if one person teaches three people how to cook something, and they teach three of their mates, that only has to repeat itself 25 times, and that's the whole population of America.
Seorang mengajar 3 orang  bagaimana memasak sesuatu, Seorang mengajar 3 orang  bagaimana memasak sesuatu, dan mereka ini mengajar 3 kawan lagi. Jika ia mengulang 25 kali, ia akan melibatkan  seluruh populasi di Amerika.