are an interesting phenomenon that appear to be kind of on the border between cryptozoology and general biology. I think this would make for a fun topic, as crypto-stuff usually does (imho).
Also, bit of a long shot, since I know the SGU doesn't do politics, but recently I've become more interested in the Iraq war, its motivations and its consequences. I realize it's a minefield, so it will be controversial, but from my admittedly limited excursion into this topic, there may be a bit more to (in particular) the whole Iraq WMD discussion than there at first appears to be in the narrative one hears in most of the press (at least on my side of the political divide, which tends to be more towards the left). That is, even after more than a decade, it is an interesting, controversial topic with a big impact, but which can be fact checked, that I don't think has been given its fair due in the skeptical community.
I was thinking of plugging a lecture here on that topic, but actually, I'd rather hear what others come up with by themselves (though if you're interested, shoot me a PM).