Two girls were born to the same mother, on the same day, at the same time, in the same month and year and yet they're not twins. How can this be ?

An infinite number of mathematicians are standing behind a bar. The first asks the barman for half a pint of beer, the second for a quarter pint, the third an eighth, and so on. How many pints of beer will the barman need to fulfill all mathematicians' wishes?

Our product and our sum always give the same answer. Who are we?

All of the flowers I have are orchids except two. All of the flowers I have are hibiscuses except two. All of the flowers I have are roses except two.

Can you tell me how many flowers I have?

Can it be possible to build a house that has all its four walls facing towards the South?

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

A man is looking at a photograph of someone. His friend asks who it is. The man replies, “Brothers and sisters, I have none. But that man’s father is my father’s son.” Who was in the photograph?

Look at the picture and find out which square is not linked with any of the other squares.

In the given figure, you can see that four match sticks are used to form a square. Can you form five squares by using six matches?

How do you go from 98 to 720 using just one letter?