What happened when the wheel was invented?

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

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

A horse was tied to a rope 5 meters long and the horses food was 15 meters away from the horse. How did the horse reach the food?

A frog is at the bottom of a 30-meter well. Each day he summons enough energy for one 3-meter leap up the well. Exhausted, he then hangs there for the rest of the day. At night, while he is asleep, he slips 2 meters backwards. How many days does it take him to escape from the well?

What is more useful when it is broken?

In a stable, there are men and horses. In all, there are 22 heads and 72 feet. How many men and how many horses are in the stable

Imagine you are in a room with no windows or doors. How will you get out?

Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

You have a three-gallon and a five-gallon measuring device. You wish to measure out four gallons.