What "trail" did thousands of pioneers follow to Oregon during the 1800s?

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What cartoonist created the bearded guru named Mr. Natural?

In what country would you find the mouths of the Yangtze river?

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What name is given to the device which consists of a frame with parallel wires carrying beads used for computation?

What two types of ashes are jointly called coal ash?

What color appears in the middle of a rainbow?

Who was originally cast as Marty in the movie "Back To The Future"?

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What continent is Sao Tome and Principe located in?