The idea that you could send one of these drones in a sensitive environment and leave it there seems off. Yeah, the air frame biodegrades, but not the motors, electronics, and the most toxic part the battery.
Don't just focus on "science" or you'll kill all interest. History is just as important. Science of itself isn't nearly as interesting as adding the human side to it. The stories of how the great ideas of our times came about and how those ideas have been used can make the knowledge come to life in a way that science by itself cannot.
There's a big problem with raw materials. All the resources that are easy to get are gone. No more near surface iron, copper, zinc, tin, lead, etc.
Try the local land fill.
I also wouldn't be surprised if the CIA really shot the jet down, or were somehow involved with both sides.
Reading the news from the US, Ukrainian, Russia, BBC, Israel, and China I can't help but think there is something deeper going on. They all are saying about the same thing, though assigning blame according to their own national propaganda.
If public opinion becomes strong enough and national hate is built to sufficient levels in both countries war is going to happen, and millions will die.
Please people don't get sucked into to the nationalist propaganda!