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 Einstein's  Problem

The author of this problem is Albert Einstein who said that 98% of the people in the world couldn't solve it.

 Facts:
1. There are 5 houses (along a street) in 5  different  colors:
       blue,  green,  red,  white  and  yellow.
2. In each house lives a person of a  different  nationality:
       Brit,  Dane,  German,  Norwegian 
      and  Swede.
3. These 5 owners
drink a certain beverage:
       beer,  coffee,  milk,  tea  and  water;
smoke a certain brand of cigar:
       Blue Master,  Dunhill,  Pall Mall,
       Prince  and  blend;
and keep a certain pet:
       cat,  bird,  dog,  fish  and  horse.
4.  No  owners have the  same pet, smoke the same brand of  cigar, or drink the same  beverage.
 Hints:
1. The  Brit  lives in a  red  house.
2. The  Swede  keeps  dogs  as pets.
3. The  Dane  drinks  tea.
4. The  green  house is on the  left  of the  white  house (next to it).
5. The  green  house owner drinks  coffee.
6. The person who smokes  Pall Mall  rears  birds.
7. The owner of the  yellow  house smokes  Dunhill.
8. The man living in the house right in the  center  drinks  milk.
9. The  Norwegian  lives in the  first  house.
10. The man who smokes  blend  lives  next  to the one who keeps  cats.
11. The man who keeps  horses  lives  next  to the man who smokes  Dunhill.
12. The owner 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  blend  has a  neighbor  who drinks  water.

The question is:  Who keeps fish?

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