Misc: In Greek mythology, what were Medusa, Stheno and Euryale collectively known as?

Questions

For what country did Columbus make his historic voyage?

For what does i.f.p stand?

For what genre of book is Isaac Asimov famous?

For what is tea from willow bark good for relieving?

For what monumental creation are we indebted to the sculptor Gutzon Borglum?