Irene killed hundreds of people mercilessly and yet the police were not able to put her behind the bars. Why?

I am a prime number.
The double of myself is equal to the square of me.

which number am I?

On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?

Can you name some countries which do not have the alphabet 'A' in them?

Place a mathematical symbol between the numerals 5 and 9 in such a way that the resulting number is greater than 5 but smaller than 9.

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?

Count the number of balls in picture below:

What has six faces, but does not wear makeup, has twenty-one eyes, but cannot see?

Next Number in the Series,

5, 16, 49, 104, ?

Be active and find the killer in the picture Riddle below.