handwritten cheques—an archaic system for transferring money that I want to underscore I believe is nevertheless perfectly ordinary and fine—and will no doubt be with us until money itself is somehow abolished.
Well, in the US. As a consumer in Europe (at least the countries I've lived in), getting a cheque book from your bank is in most cases impossible, and I'd say that's probably for the better.
Still, fun article.
All credible reporting I've seen is relatively certain that it was a small amount of military grade explosives.
If you have the device in front of you, and are prepping it for your secret operation, that also seems like a much more straightforward solution than trying to manipulate a lithium ion battery in a way that both allows it to work normally for years, but then explode violently enough to kill someone holding it.