Why do people go to bed?

A man is found unconscious in front of a store at two in the morning. His head is bleeding and there’s a brick laying next to him. When the police arrive, they carry the man to jail. Why did they arrest him?

On a certain day, John celebrated his birthday. Two days later, his older twin brother Jacob celebrated his birthday.

Is this even possible? How can it be?

Consider this about a word: The first two letters signify a male, the first three letters signify a female, the first four letters signify a great, while the entire world signifies a great woman. What is the word?

We have four gears with below features=> Both Gear A and D has 60 teeth=> Gear B has 40 teeth=> Gear C has 20 teeth=> Every two minutes, Gear B makes 25 full turns.What is the relative speed of Gear A and Gear B?

I have cities, but no houses. I have mountains, but no trees. I have water, but no fish. What am I?

What goes up but never comes down?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

In the image given, you can find several triangles. Can you count them all?

It's a protector.
It sits on a bridge.
One individual can see directly through it, while others wonder what it hides.

What is it?