Top 50 Sci-Fi Kindle author

Wow! I just noticed that I'm ranked among the Top 50 Sci-Fi Kindle authors on Amazon. And two spots ahead of Arthur C. Clarke, one of the giants of SF. Okay, so he's been dead for a few years, and most of his novels came out before ebooks, but still.... Pretty cool, I think. (And my first three books have been out for only 4-8 weeks, with the fourth coming in eight days.) Hmm. Of perhaps even more significance, I'm also #67 among all authors of Teen books (not just Kindle or SF). My books aren't even targeted at the YA market, but apparently they appeal to teens. :)