What four weights can be used to balance from 1 to 30 pounds?

The barber of Town shaves all men living in the town. No man living in the town is allowed to shave himself. The barber lives in that town. Who then shaves the barber of the town?

Imagine a box with two cogwheels, one big with 24 teeth and one small with 8 teeth. The big one is firmly attached to the center of the box which means it does not turn or move while the small one rotates around the big one.

How many times do you think that the smaller wheel will turn compared to the box when it turns once around the big one?

You have three orange, two pink and five purple balls in the drawer beside your bed. There is no electricity and the room is entirely dark. How many balls must you take out to ensure at least one ball of each colour at least?

I am the beginning of everything, the end of everywhere. I'm the beginning of eternity, the end of time and space. What am I?

Things are just as they seem, right? Well, check again.
Can you count the number of tigers in this picture ?

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

What has no start, end, or centre?

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

What is so fragile that saying its name breaks it?