You know, I checked wiki and
you're all wrong!
Osmium isn't densest. It's just one of the densest. However, it can be googled because it is widely known as the densest. I think in space though, somehow osmium is defeated by iridium.
Anyway, further reading in
this article (at applications) reveals the apparent lack of chemical knowledge by the mafioso. Osmium is
extremely toxic, and rarely is used in its pure form. Also, as you would naturally expect from an extremely dense metal,
it is very very very hard and brittle. You could
not loop it around a person's neck without it snapping. Even if by some miracle you could, the toxic would probably be enough to kill them, and you wouldn't hold on. Why? BECAUSE IT'S TOXIC AND HARD! It would probably have cut the neck somehow and entered the bloodstream, or if it's potent enough even just burn right through the skin. It's also highly unlikely that someone can rip it apart when deprived of an oxygen supply.
Hence, it's probably someone trying to frame disco. However, he's an engineer who has no need of knowing the dense elements well. As he's an engineer, he'll be interested in smelly physics anyway. He probably wouldn't know this much about osmium, and so wouldn't include this detail. He'd be too busy playing DD and playing with his shrunken head to look it up as well, IMHO.
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