Misc: Whats towns problem with rats was solved by the Pied Piper?

Questions

In which constellation in the night sky is there to be found the only confirmed "Black Hole"?

Name the computer which beat World Chess Champion Garry Kasparov in 1997?

The well-known aria "La Donna e Mobile" features in which Verdi opera about a court jester?

In which country would you find the Pripyet Marshes?

In which John le Carre novel does George Smiley first appear?