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: Adivina quién soy; Cuando voy, vengo, Y cuando vengo, voy.

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Answer: El cangrejo

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Riddle: A huge mythical animal said to resemble a whale.

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Answer: Leviathan.

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Riddle: What can go up and down without moving?

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Answer: The temperature

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Riddle: Though invisible, I keep things near, a force that shapes the cosmic sphere. What am I?

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Answer: Gravity

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