What are the next two letters in the following series and why?
W A T N T L I T F S _ _

*Hint: Check Puzzle Title

Two guards were guarding the camp.Guard-1 was looking towards the south to make sure no threat is coming from the road.Guard-2 was looking at the north to make sure no threat is coming from the top. Suddenly Guard-1 ask the Guard-2 why he is smiling?How Guard-1 knows that Guard-2 is smiling?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?

I know a ten-letter word in the English language which can be typed using only the top rows of the computer keyboard.

If you read clockwise, you can form a word by inserting three missing letters in the picture given below. Can you do it?

There are four 3-link chains. All you have to do is join them into a big 12-link chain. For joining two closed links, one of the links must be cut and placed onto the other link for closing.

How many minimum links will you have to cut to make the big chain?

Jack was having a candle light dinner with his girlfriend. Suddenly a cold gush of wind entered through the open window and three of the ten candles were extinguished. Assuming that none of the other candles were extinguished.

How many candles are they left with in the end ?

Can you think of any three-dimensional shape that comprises of exactly two surfaces?

In 1990, a person is 15 years old. In 1995, that same person is 10 years old. How can this be?

Who is that with a neck and no head, two arms and no hands? What is it?