Why do we preferably have round manhole covers and not square ones?

Which is faster, Heat or Cold ? Explain.

As you can see that fifteen matches have been used to form an arrangement. What you have to do is remove any six of them to make them ten.

With the help clues provided in the image, can you find the 5 digit key?

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

A newspaper is supposed to have 60 pages, but pages 24 and 41 are missing.
Which other pages won't be there?

You have 10 balls with you. A friend of yours out of nowhere asks you to place those ten balls in five lines such that each of the lines has exactly 4 balls on them. He needs to check your intelligence. Prove him by doing the task.

There are people and strange monkeys on this island, and you can not tell who is who (Edit: until you understand what they said - see below). They speak either only the truth or only lies.
Who are the following two guys?
A: B is a lying monkey. I am human.
B: A is telling the truth.

What kind of band never plays music?

If six children and two dogs were under an umbrella, how come none of them got wet?