This presents some interesting points on how a new language is learned and why certain methods work and why others don't. I'm still on the fence about what they talk about here, but i'm willing to try them out.
For example, a study showed that putting Spanish subtitles on a video did not help Spanish learners develop their English. I don't see how that works because I've generally learned to understand Japanese better that way. I don't know. I'll withhold judgment and you can decide for yourself if it's helpful or not. :)