What is both possible and impossible at the same time?

Who is that with a neck and no head, two arms and no hands? What is it?

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

A donkey is behind another donkey
I'm behind that second donkey
But there is a whole nation behind me

It is a murder you can describe in a word.

Why did Navjot Singh Sidhu put the new January calendar in the freezer

Take number 1000 and then add 20 to it.
Now add 1000 one more time.
Now add 30.
Now add 1000 one more time.
Now add 40.
Now add 1000 one more time.
Now add 10.

What is the total?

What does Alexander the Great and Winnie the Pooh have in common?

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?

If you had a pizza with crust thickness 'a' and radius 'z', what's the volume of the pizza?

Different lights make me strange by changing me into different sizes. What am I?