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What goes up and down the stai...

What goes up and down the stairs without moving?

Correct answers: 41

The first user who solved this task is Djordje Timotijevic.

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DUDE, IT'S FRI...

DUDE, IT'S FRIDAY.. CHEER UP!

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Yangtze River blocked for new dam

In 1997, Chinese engineers completed the blocking of the Yangtze River, the first step toward what would be the world's largest hydroelectric dam project.*

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