Oh, the horcruxes. I didn't know either until I finished school. And even then, I did a sabbatical year where I did nothing but teach English and eat Korean food.
I will. I just need some time to gather myself before I do.
None - and if there were, we'd just smack them down before it got wholly out of hand. But we've been checking known DE locations every decade or so, to see if there's something we've missed. After all, there's still quite a number of people from both wars that are unaccounted for. But we're been getting there.