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: Once upon a time there was a beautiful princess named Anna. Anna's father, the King, wanted to be sure his daughter married an intelligent man. To test his daughter's suitors the King hid Anna's picture in one of three boxes. The suitor had to be able to select the box with Anna's picture on one try and within twenty seconds. On the gold box was the message “Anna's picture is in this box“. The silver box had the message “Anna's picture is not in this box.”“Anna's picture is not in the gold box”was written on the bronze box. The King would tell each suitor “Only one of the three messages is correct.”Which box contained Anna's picture?

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Answer: The silver box contained Anna's picture. If her picture had been in the gold box, two statements would have been true. (The messages on both the gold box and the silver box.) If her picture had been in the bronze box, two statements would have been true. (The messages on the bronze box and the silver box.)

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Riddle: A king decided to let a prisoner try to escape the prison with his life. The king placed 2 marbles in a jar was glued to a table. One of the marbles was supposed to be black, and one was supposed to be blue. If the prisoner could pick the blue marble, he would escape the prison with his life. If he picked the black marble, he would be executed. However, the king was very mean, and he wickedly placed 2 black marbles in the jars and no blue marbles. The prisoner witnessed the king only putting 2 black marbles in the jars. If the jar was not see-through and glued to the table and the prisoner was mute so he could not say anything, how did he escape with his life?

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Answer: The prisoner grabbed one of the marbles from the jar and concealed it in his hand. He then swallowed it, and picked up the other marble and showed everyone. The marble was black, and since the other marble was swallowed, it was assumed to be the blue one. So the mean king had to set him free.

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