What are those spinny things that smaller airplanes use to move?

Props to whoever can answer this.

A man has some time off...

A man is told by his psychiatrist to have some time off so he decided to go off to Basque to spend some time with a family there to get away from it all. He spends a good few years there with a family with 10 children and enjoys himself tremendously. Feeling thoroughly relaxed and ready to go back t...

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