The percentage of electronics at the end of their lives which were recycled.
The EPA found that the percentage remained consistent from 1999-2005. Even as recycling rates went up, the amount of electronics reaching end of life outpaced the increase, leaving the figure static. (source: EPA, July 2008)
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Odiwan, dude, you have to have an HD radio in order to hear the HD Radio broadcast. Not unlike, oh, HDTV.
And while no, HD Radio doesn't sound as good as PCM Dolby Digital (the audio in HD audio), it sounds a whole lot better than regular FM. A WHOLE lot.
And not to diss answers.com (answers.com, really?), but "definition" doesn't refer only to visual image quality. Audiophiles will recognize the term as refering the level of detail discernible in the audio signal. How crystal clear is the triangle in that symphony? Can you hear not just the sound produced by that cello, but also its acoustic resonance? "Well defined" is a badge of honor for a good sound system and a good source recording.
Bottom line: lets not be HD snobs. High definition means "far greater clarity and detail than you are used to from the analog century." And we should embrace it if it means that the broadcast and media companies will upgrade their infrastructure, all to enhance our experience.