The world's smallest biomolecular computer was created a few years ago by Professor Ehud Shapiro and researchers at Israel's Weizmann Institute Reuters reported. Reuters report goes on to say that “The microscopic computer is so minuscule a trillion could fit in a drop of water.”

The microscopic computer’s software is made up of  DNA molecules. Enzymes are used as the computer's hardware in addition to manipulating DNA. This computer may eventually be able to detect diseases in the body such as cancer and release a treatment drug.

The DNA computer could one day replace biopsies by diagnosing a disease within the body tissue. "Our medical computer might one day be administered as a drug, and be distributed throughout the body by the bloodstream to detect disease markers autonomously and independently in every cell," said Shapiro.

Treatment this advanced could detect cancer in its earliest stages before tumors have actually formed within the body. Shapiro has no problem admitting that a DNA computer roaming around the body spotting and treating disease is still a long way away. "There are many, many hurdles. It could take decades," Shapiro said, adding that he and his colleagues had not expected to accomplish this step so quickly.