The research team from the Karolinska Institute in Sweden has developed a DNA nano-robotic device that carries a "weapon" which only activates in the tumor microenvironment. After mouse experiments, the tumor growth was effectively reduced by 70%. Let's take a trip back to 1966, to the science fiction movie "Fantastic Voyage," where a Soviet scientist escapes to the United States, on the brink of death due to spy-induced damage to his blood vessels. Five American doctors shrink to a fraction of