At least I HOPE they're revealed. Because when I wrote here about my adventures in worm composting, commenters let me know that worms are invasive and we'd all better watch out. And I've noticed that that's no isolated concern. At DC's recent GreenFest the woman teaching vermicomposting was grilled on the subject – and didn't have an answer. So I hit the books and the search engines and the answers I found are over on my blog.
Photo credit: Red Worm Composting.