The horrors of the nuclear age, in terms of exploding reactors and nuclear bombs, are well known. Behind the well-publicized threat of mass death lies a secret history of nuclear projects being used to destroy individuals. In the late 1940s, United States citizens were injected with plutonium without their knowledge.

After attaching to the target cell, the barrel shape nanorobot opens and delivers its cargo.

Researchers at Harvard University said they have successfully made a DNA robot which acts almost as a postal worker and is capable of targeting particular cells such as cancerous cells and deliver them self-destruction order.