How can a man go eight days without sleep?

Make eight squares by moving only two matchsticks.
Note- Square can be of different sizes.

If it took eight men ten hours to build a wall, how long would it take four men to build it?

Count The number of F's in the paragraph below:

"FINISHED FILES ARE THE RESULT OF YEARS OF SCIENTIFIC STUDY COMBINED WITH THE EXPERIENCE OF YEARS"

What number comes next in this sequence:
7 8 5 5 3 4 4 _

There are are five things wrong with this sentence; only geniuses will be able to to spot all of the mitstakes

What kind of band never plays music?

You have four chains. Each chain has three links in it. Although it is difficult to cut the links, you wish to make a single loop with all 12 links. What is the fewest number of cuts you must make to accomplish this task?

By using 'because' continuously three times, can you make an English statement ?

Which digit occurred maximum times between the number 1 and 1000?