The original question posed by Einstein was “Who keeps the fish?”
I want to know who is in each house, who smokes what cigar, what color house do they live in, what pet do they have, and what beverage do they drink.

In a street there are 5 houses painted 5 different colors.  In each house lives a person of a different nationality.  The 5 homeowners each drink a different beverage, 
smoke a different brand of cigar, and keep a different pet.

The question is:  Who keeps the fish?

HINTS:

1.	The Brit lives in the red house.
2.	The Swede has a dog.
3.	The Dane drinks tea.
4.	The green house is on the left of the white house.
5.	The owner of the green house drinks coffee.
6.	The person who smokes pall mall has birds.
7.	The owner of the yellow house smokes Dunhills.
8.	The man living in the center house drinks milk.
9.	The Norwegian lives in the first house.
10.	The man who smokes blends lives next to the one who has cats.
11.	The man who has horses lives next to the man who smokes Dunhills.
12.	The man who smokes blue master drinks beer.
13.	The German smokes prince.
14.	The Norwegian lives next to the blue house.
15.	The man who smokes blends has a neighbor who drinks water.

Albert Einstein wrote this riddle in the early 20th century.  He said that 98% of the population would not be able to solve it.  Good luck.