What four periodic elements, when...

Riddle: Shiny like a silver, denser than lead, pricier than gold, could stop a bullet, if I wanted to. What am I?

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Answer: Osmium

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Riddle: What’s the loneliest of all physics concepts?

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Answer: The singularity

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Riddle: What can eat a lot of iron without getting sick?

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Answer: Rust

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Riddle: What can break, but never fall? What can fall, but never break?

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Answer: Day and night

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Riddle: What has wings, but can not fly. Is enclosed, but can outside also lie. Can open itself up, or close itself away. Is the place of kings and queens and doggerel of every means. What is it upon which I stand? Which can lead us to different lands.

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Answer: Stage

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Riddle: It's black when you get it, red when you burn it, gray when you’re done with it. What is it?

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Answer: Charcoal

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