A story is not like a road to follow...it's more like a house. You go inside and stay there for a while, wandering back and forth and settling where you like and discovering how the room and corridors relate to each other, how the world outside is altered by being viewed from these windows.

All things are possible until they are proved impossible – and even the impossible may only be so, as of now.

Mathematics knows no races or geographic boundaries; for mathematics, the cultural world is one country.