Brain teaser

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A donkey can only camel 100 catties of grain to cross the bridge, and four donkeys have to cross the bridge at one time. How to camel?

What bag everyone has, but few people lend it to others?

What is it that a magnifying glass cannot magnify?

Why did I ride a green cow out of the customs?

What is the simplest way to do things?

Does the child of an infertile woman inherit her infertility?

How do pigs get on trees?

What organs in a man magnify more than three times when stimulated?

What is 123?

Where is the place to ask for trouble?

Pipi, who has just studied English for a month, can talk to foreigners without any difficulty. Why?

"Failure is the mother of success", what is success for failure?