Look at this sequence from top to bottom. What is the next number in the sequence?
1
11
21
1211
111221
312211

You can take four of the five letters out of this word, but the pronunciation never changes. What is the word?

Why Aeroplane windows are round?

The more of this there is, the less you see. What is it?

Can you count the number of seconds in a year?

Clue: You need to bother about calculation.

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

What always comes into a house through the keyhole?

Why Wine Glass Stem is so long?

John is a strange liar.

He lies on six days of the week, but on the seventh day, he always tells the truth.

He made the following statements on three successive days:

Day 1: "I lie on Monday and Tuesday."
Day 2: "Today, it"s Thursday, Saturday, or Sunday."
Day 3: "I lie on Wednesday and Friday."

On which day does John tell the truth?

You are given a set of weighing scales and 12 marbles. The scales are of the old balance variety. That is, a small dish hangs from each end of a rod that is balanced in the middle. The device enables you to conclude either that the contents of the dishes weigh the same or that the dish that falls lower has heavier contents than the other. The 12 marbles appear to be identical. 11 of them are identical, and one is of a different weight. Your task is to identify the unusual marble and discard it. You are allowed to use the scales three times if you wish, but no more. Note that the unusual marble may be heavier or lighter than the others. You are asked to both identify it and determine whether it is heavy or light