What famous saying does this rebus mean?

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My cousin lives in one story house in Antarctica. His house is made the of-of sandstone. what is the color of stairs?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

What do you answer even though it never asks you questions?

Who can jump higher than a Mountain?

Two boys were admitted to a school. When the headmaster asks them about their parents, they tell him that they have same parents (father and mother). On further inquiry, it turns out that they both share the same date for their birthday.

"Are you twins," ask the headmaster.
"No," replies the boys.

Is it possible?

If you say my name, I will no longer exist. What am I?

The first box has two white balls. The second box has two black balls. The third box has a white and a black ball.

Boxes are labeled but all labels are wrong!

You are allowed to open one box, pick one ball at random, see its colour and put it back into the box, without seeing the colour of the other ball.

How many such operations are necessary to correctly label the boxes?

I’m tall when I’m young, and I’m short when I’m old. What am I?

2 ladies and 2 girls need to cross a river in a boat big enough for 1 LADY or 2 girls. How do they do it?