Lifeless eyes on my smiling face and watch your child's sleeping place. In their dreams they hold me tight. What am I?

Can you find out which number multiplied by itself will give the output as 12345678987654321?

You are given a cube that is made with the help of 10x10x10 smaller cubes summing up to a total of 1000 smaller cubes. You are asked to take off one layer of the cubes.
How many remain now?

There is one four-digit whole number n, such that the last four digits of n2 are the original number n

What work can one never finish?

What goes through cities and fields, but never moves?

What is the word or phrase?

What can you catch but never throw?

In the following picture, E is going to slide the object down and as per the terrain and the physics, the round object is going to travel all the way till the end. Now, can you analyze who all people will die when it happens?

Always in you, Sometimes on you;

If I surround you, I can kill you.

What am I?