> I hope that every year of my life, I look back, and laugh at the things I 'knew' 10 years ago.
You know what? I never did do that, and I'm starting to think I never will.
There may be many 20-year-olds that "knows" many things (in the same scare quotes you indended), but there are a lot of 30- and 40-year-olds who do that as well. I have a growing suspicion these may all be the same people...
To an extent yes, but that slows down the older you get.
>The oft-repeated idea of an "underdeveloped" teenage brain is a bit old. Scientific American did a piece on it in 2007.
That article itself is outdated. There are numerous studies done since then that support my assertion.
Here's a few articles.
2011 http://www.edinformatics.com/news/teenage_brains.htm
2011 http://ngm.nationalgeographic.com/2011/10/teenage-brains/dob...
http://www.npr.org/templates/story/story.php?storyId=1411647...
http://phys.org/news/2010-12-brain-fully-mature-30s-40s.html
http://online.wsj.com/news/articles/SB1000087239639044371370...
http://www.npr.org/templates/story/story.php?storyId=1241194...