I can write cow in 13 letters.

Can You?

Why do people go to bed?

What do you call a fish without an eye?

What always comes into a house through the keyhole?

What is both possible and impossible at the same time?

It's a 7-letter word.
If we remove 1 letter from it, it remains the same.
If we remove 2 letters from it, it remains the same.
If we remove 3 letters from it, it remains the same.
If we remove all the letters from it, still it remains the same.
What is it?

What kind of tree can you carry in your hand?

What is greater than gold but cannot be bought. it can never be sold and can earn if its sought. though it can be broken, it can still be fixed. for by birth it can't start nor by death it is ended.what am i?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?

I have branches, but no fruit, trunk or leaves. What am I?