It can't be seen, can't be felt, can't be heard, and can't be smelt.
It lies behind stars and under hills, And empty holes it fills.
It comes first and follows after, Ends life, and kills laughter.
What is it?

What work can one never finish?

How will you measure 15 minutes using two hourglasses of 7 minutes and 11 minutes respectively?

John named his first son Alpha, second Beta, third Charlie and fourth Delta. What is the fifth son's name?

Which Travels Faster? Solve below famous picture riddle:

What happened when the wheel was invented?

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?

The person who makes it has no need for it. He who purchases it does not use it. The person who does use it does not know they are. What is it?

The teacher told the student that if he told a lie then he will be expelled from school and if he told the truth then he still is expelled from school.

What can a student say to prevent his being expelled from school?

A bag contains 64 balls of eight different colours. There are eight of each colour (including red). What is the least number you would have to pick, without looking, to be sure of selecting 3 red balls?