The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

What is the word or phrase?

Can you name an animal whose killing cannot be performed without spilling your own blood?

There is a movie name hidden in the picture that is attached with this question. Can you find out which movie is it?

What happened when the wheel was invented?

Three friends decide to distribute the soda cans they had among them. When all of them had drunk four cans each, the total number of cans that remained was equal to the cans each one of them had after they had divided the cans.

Can you calculate the total number of cans before distribution?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

In the below-given picture of a pretty girl, there is something wrong. Can you find out what it is?

When it's bad luck to meet a black cat?

Six glasses are in a row. The first three are filled with milk and the last three are empty. By moving only one glass, can you arrange them so that the full and the empty glasses alternate?