Duolingo's Secret is Discounting

It’s Saturday afternoon, and I’m in my home, amazed. My 11 year-old son is sitting in front of me, and he’s reading Japanese. Not Japanese with an English alphabet, like “Konnichiwa.” He’s reading　”それはおいしいです。”

What has me even more shocked is that he only started learning this a month ago.

Well, that’s not completely true. For about a year, I worked with …