Misc: In 1946 ---------- Carpenter, musician (Carpenters), born. ?

Questions

In which country is Tobruk?

Who was the only President of the Confederate States of America?

Which science fiction writer developed a series of ethics for robots known as the Laws of Robotics?

In which ocean would you find the islands of Sao Tome and Principe?

"Vissi D'Arte" is a famous aria from a Puccini opera in which the eponymous heroine is an opera singer. Name the opera?