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Uranium is the heaviest naturally occurring on earth, so after that on the periodic table (uranium, neptunium, plutonium…) things are made with collisions in the lab.

I bet a lot of energy went into creating that sphere…

osmium is denser than uranium, the issue is that it's quite expensive.

I'm quite curious what the circumstances of that would have been. I looked it up because I thought I was mistaken, but ya: it's nuclear reactor byproduct and itself capaple of being turned into a nuclear weapon (or only some isotopes maybe? Not sure). It also apparently is capable of just starting on fire in open air, is poisonous, radioactive obviously and accumulates in the bones. Sounds like fun stuff.

Was it warm? That was a rare experience; not many people will have done so.