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

By moving just one matchstick, you need to make the below statement true. Can you do it?

Can you arrange four 9's and use at most 2 math symbols, to make the total 100?

An explorer goes on an exposition in the jungle. He sets up camp in the middle of the jungle. The next morning he sees something with a head and a tail, but he is not afraid. What did he see in his bag?

By moving exactly three matchsticks can you make the below equation true.It can be solved by 3 ways.

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

In one of the popular batman series movie "Batman Forever", there was a riddle that goes like "Tear me off and then scratch my head and I was red then and now I am back. Who am I?

You walk into a creepy house by yourself. There is no electricity, plumbing, or ventilation. Inside you notice 3 doors with numbers on them. Once you open the doors you will die a particular way. Door No.1 You’ll be eaten by a lion who is hungry. Door No.2 You’ll be stabbed to death. Door No.3 There is an electric chair waiting for you. Which door do you pick?

A network of 20 x 10 squares is given to you.

Can you calculate how many unique squares and rectangles can be formed combining two or more individual squares ?

What is the word or phrase?