Misc: what do the initials "us" stand for in the name "us grant"??

Questions

Trivia : Which is Europe's largest country after Russia?

Trivia : A plant produced by crossing different species is know as what?

Trivia : How many times would Japan fit into an area the size of the U.S?

Trivia : Which writer established the three laws of robotics?

Trivia : What does the musical term "rallentando" mean?