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 man is locked in a room with a serial killer. The killer says that he will allow the man to escape if he can beat him in the serial killer's favorite game. If the man loses, the serial killer will kill him. The rules of the game are as follows: 1. Each man must take turns placing a coin on a perfectly round table. 2. The coins must lay flat. 3. The coins cannot overlap each other. 4. The coins cannot hang off the edge of the table at all. 5. The first man to run out of room to place a coin on the table loses. The serial killer is very confident in his ability to win at this game, so he lets the man go first. What can the man do to guarantee that he wins the game?

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Answer: The man must first place a coin in the center of the table. He then must replicate every move the serial killer makes on the opposite side of the table. Eventually the serial killer will run out of places to place a coin and the man will win.

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