Finishing my book

I have just finished my FVR book, it was a really good book, it is called 1984 and the guy relate how is the live under a new world order and there is just one authority called Big Brother, they can hear, watch, and know whatever you do ( sounds familiar??), this happened in London in 1984, it was a very good book, the surprising thing is that the author wrote this book in 1949, how he could know that his book will become a reality after 50 fifty years??, this just amazed me.