In HPMOR Harry quickly learns that (amongst other thing) that if one applies some creativity and scientific knowledge to magic, one can trivially assasinate Bad Guys. He doesn't really make use of that, but considers it doable if necessity arises.
But this is also true in our world. If one wants to kill a Bad Guy (a dangerous president, PM or some other sort of Dark Lord), there are easy ways (though not completely risk free). Off the top of my head: smear something that a Bad Guy will touch with dimethylmercury. It permeates through skin in seconds and kills within months. Chelation therapy can help, but probably it's effective only within first hours from contact. Synthesis isn't terribly problematic. You can put in on some paper and smuggle as a used tissue. Of course you can't handle it with gloves (it gets thrugh latex and gloves would be suspicious), but a crumbled tissue will do well. (Your fingers would be just physically too far for dimethylmercury to diffuse). The biggest risk would be poisoning yourself. And it's a fair risk, though you can diminish it by starting early on chelation.
It seems simple. It is definitely risky, but not a sure death. So if assasination can be done this easily, why aren't there more of them? Any ideas?
Does anybody knows any moodtracking app that asks you about your mood at random time of the day? (Simple rating of the mood and maybe some small question about whether something happened that day influencing your mood) All I found needed me to turn on the app, which meant I used to forget to rate my mood or when I was down I just couldn't be bothered. So it would be perfect if it would just daily pop-up an alert, make me choose something and then disappeared.