fullstory 'Man to become immortal by 2029': scientist London, Sept 24 (PTI) A futuristic American scientist has predicted that man could become immortal in as little as 20 years' time through nanotechnology and better understanding of the body mechanism. Ray Kurzweil, known to have predicted future technologies decades ahead has written in The Sun ,"I and many other scientists now believe that in around 20 years we will have the means to reprogramme our bodies' stone-age software so we can halt, then reverse, ageing. Then nano-technology will let us live for ever." The 61-year-old, lauded by Microsoft founder Bill Gates as the smartest futurist on Earth said," We are living through the most exciting period of human history. "Computer technology and our understanding of genes - our body's software programs - are accelerating at an incredible rate. " The scientist says that already, blood cell-sized submarines called nanobots are being tested in animals.