What work can one never finish?

What can you see in the middle of March and April that you can never see in any other month?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

The following alphametic has only one solution. Can you find it?
ENLIST + SILENT + LISTEN = ANAGRAM

PS: You may start the number from 0.

The measurement of time, That can't be found on a clock, But can be looked upon on a map.

Who is He ?

Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I never was there, I am always to be.
You have never ever seen me, not ever you will.
Yet I am the confidence of everyone.

Who Am I?

Why is a river so rich ?

What three numbers, none of which is zero, give the same result whether they’re added or multiplied?

When can we add 2 to 11 and get 1 as the correct answer?