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

Two-person want to cross a river. Only one boat is present on the riverside that can carry only one person at a time.

However, they still manage to cross the river. How is it possible?

I have four wings but can't fly.
I express no emotions.
I am found on the exact spot every time you look.
I keep toiling away with a little sound.

Do you know what am I?

What number does the below three word/phrase identify and why?
1. Deck
2. Year
3. Singing in the Rain

How many letters are in the alphabet?

What has many keys but can’t open a single lock?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

How can a man go eight days without sleep?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

A man started to town with a fox, a goose, and a sack of corn. He came to a stream which he had to cross in a tiny boat. He could only take one across at a time. He could not leave the fox alone with the goose or the goose alone with the corn. How did he get them all safely over the stream?