You are an expert on paranormal activity and have been hired to locate a spirit haunting an old resort hotel. Strong signs indicate that the spirit lies behind one of four doors. The inscriptions on each door read as follows:

Door A: It's behind B or C
Door B: Its behind A or D
Door C: It's in here
Door D: It's not in here

Your psychic powers have told you three of the inscriptions are false, and one is true. Behind which door will you find the spirit?

Your last good ping-pong ball fell into a narrow metal pipe embedded one foot deep in concrete.
How can you get it out undamaged, if all the tools you have are your tennis paddle, shoe laces, and plastic water bottle, which does not fit into the pipe?

Which tank will fill first?

I have eight fingers and two thumbs but I do not live. What Am I?

The following sentence is false. The preceding sentence is true.
Are these two sentences true or false?

There are forty elephants and they have forty-fore heads. How can this be possible?

Next Number in the Series,

5, 16, 49, 104, ?

What can you hold in your right hand, but never in your left hand?

How many times can you subtract the number two from the number fifty?

In The 1st month of this year(the year 2013), I noticed that the date 13-1-13 (13 January 2013) is special.

This date is special as:

Date * Month = Year.

Can you figure out which year of this century has a maximum number of such dates?