What seven-letter word has hundreds of letters in it?

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?

10+10 and 11+11 can give you the same answer.

Explain how?

You are on a Boat in the mid of a river. You have two cigarettes with you. One of these two you have to light, how will you light the cigarette?

What does the below mathematical rebus mean?

Where do you go to learn how to make ice cream?

Why is it very easy to weigh a fish?

A red house is made out of red bricks. A yellow house is made out of yellow bricks. And, a blue house is made out of blue bricks. So, what is a greenhouse made of?

What is the end of everything?

Forwards I am heavy, backward I am not. What am I?