in rio even if i can't afford to go there in real life or if i am scared to visit certain parts of the world because i'll never get to the moon in real life and that's the great thing about virtual reality you can go anywhere you like. but it's not just for fun and games as important uses in medicine to. computer scientists stephanie speidel from germany's national center for diseases develops intelligent assistant systems for surgery. technology enable surgeons like yoga invites to better plan their operations such as removing from a liver. our biggest problem concerns the precise planning of the operation knowing in advance exactly what will be doing anatomic quite knowing the connection the location of the tumor and the essential blood vessels and then there's also the question of how much of the