What number when divided in half becomes zero?

A mad serial killer kidnaps people and forces them to play the game of 2 pills with them, In this game, there are pills in the table and one of them is normal pill while the other one is deadly poisonous.
The victim will choose one pill and the killer will pick the other pill and both simultaneously will swallow the pill with water.
victim dies every time.

One day the serial killer kidnaps the Joseph and forces him to play the same game with him.

Joseph solves the mystery of the two pills and remains alive.

Explain?

Railroad Crossing, look out for the cars. Can you spell that, without any R's ?

I am five letter word that is under you.
If you remove my 1st letter, then I am over you.
If you remove my 1st and 2nd letters then I am all around you.

Who am I?

In this image, you can see three almost identical Doraemon images. Can you spot the odd one out from them?

81 x 9 = 801. What must you do to make the this equation true?

What is black when you buy it, red when you use it, and gray when you throw it away?

Identify the movie name through below Rebus containing Pi Mouse and coconut tree..

A tree doubled in height each year until it reached its maximum height over the course of ten years. How many years did it take for the tree to reach half its maximum height?

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?