Brain teaser

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What kind of river people will never cross?

Where is the source of the Yellow River?

One is facing the sky, the other is facing the ground, the other is very painful and the other is very happy. What is this doing?

There is a kind of cowhide that is most easily punctured. What kind of cowhide is that?

The new version of the paper currency is printed differently. Why?

Do you know how long a person's calf should be?

Who is the guy who wanders around the streets all day and loves "meddling?

What horse can't run?

What in the world carries people at a speed of nearly 2000 km/h without refueling or other fuel?

The plane that had just taken off suddenly fell to the ground with smoke. Why was no one injured?

What can I borrow and not return it?

Why are fat people more afraid of sun than thin people?