Renowned physicist Dr Michio Kaku says that the world of science fiction may be closer to reality than fantasy.
So if you thought that invisibility cloaks, time travel and teleportation were for the silver screen only, think again.
Dr Kaku is a theoretical physicist and the co-founder of string field theory, a branch of string theory, often referred to as "the theory of everything".
In his recent published book, Physics of the Impossible, he considers the phenomena of science fiction, including time travel and invisibility.
He was shocked to find that almost all of them were consistent with the known laws of physics.
According to Dr Kaku, most of what we see on the silver screen is possible - it is just a question of time.
"A lot of the predictions made by science fiction writers have been replaced by the march of science," he told BBC World Service.
http://news.bbc.co.uk/2/hi/science/nature/8221009.stm