A certain street contains 100 buildings. They are numbered from 1 to 100. How many 9's are used in these numbers?

Why Aeroplane windows are round?

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?

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

Who is He ?

Readers with the sharpest vision can find the eagle in the mountains in 6 seconds. Are you one of them? Test your observation skills now!

The Puzzle: A girl, a boy, and a dog start walking down a road.

They start at the same time, from the same point, in the same direction.

The boy walks at 5 km/h, the girl at 6 km/h.

The dog runs from boy to girl and back again with a constant speed of 10 km/h. The dog does not slow down on the turn.
How far does the dog travel in 1 hour?

I can be cracked, made, told, and played. What am I?

On this table for two, something is missing for the other one. Your task here is to find the food item that does not have its pair on the table.

What is in seasons, seconds, centuries and minutes but not in decades, years or days?

A man lives on the fifteenth floor of an apartment building. Every morning he takes the elevator down to the lobby and leaves the building. In the evening, he gets into the elevator, and, if there is someone else in the elevator, or if it was raining that day, he goes back to his floor directly. Otherwise, he goes to the tenth floor and walks up five flights of stairs to his apartment. Can you explain why he does this?