Until it is measured, not known. Yet how you miss it when it has gone. What is it?

Three people are in a room. Ronni looks at the Nile. The Nile looks at Senthil. Ronni is married but Senthil is not married. At any point, is a married person looking at an unmarried person? Yes, No or Cannot be determined.

First, think of the colour of clouds. Next think the colour of snow. Last, think of the colour of the moon. Now, what do cows drink?

A finger goes in me. You fiddle with me when you're bored. The best man always has me first. What am I?

Where do you go to learn how to make ice cream?

Assume there are approximately 5,000,000,000 (5 billion) people on Earth. What would you estimate to be the result, if you multiply together the number of fingers on every person's left hand? (For the purposes of this exercise, thumbs count as fingers, for five fingers per hand.) If you cannot estimate the number then try to guess how long the number would be.

You walk into a room that contains a match, a kerosene lamp, a candle and a fireplace. What would you light first?

There are five vowels (a, e, i, o, u) in the English language.
Can you tell us a word that contains all these vowels?

How can you drop a raw egg from a height onto a concrete floor without cracking it?

What has to be broken before you can use it?