Fiesta Fan Forums - Informataive Speech Topic

I'm asking you guys to give me ideas for speech topics again! This time it's an informative speech. I don't know the rules right now, but I know i'm going to start on it this week. If i were to do it right now, i'd to it on black holes. Hopefully i can make that interesting for my classxD But I kind of want to do it one something about humans. like... Like, the teacher told us some examples, some of them were: people faking their own deaths, forgot what it was called, people who have never had human contact, and people who were raised in the wilderness. Those things are really interesting, but knowing that someone already did a topic on that makes me not want to do it. But I would like to do something like those. So gimme ideas.