[videoembed size="full_width" alignment="center"][/videoembed] (via Unique Daily) At first this just seems like a charming video of a 10-year-old boy playing Nirvana's "Smells Like Teen Spirit" on an acoustic guitar. But it's actually pretty serious. Because the same kid, Sungha Jung, posted a previous video of himself playing "Smells Like Teen Spirit" back in May of 2007, when he as only ...