english: OK, so if I make a 100-nanometer cancer detector, I inject it in the bloodstream, it can leak into the tumor where it's activated by tumor enzymes to release a small signal that is small enough to be filtered out of the kidney and put into the urine, I have a signal in the outside world that I can detect.
non_english: Dakle, ako napravim detektor za rak od sto nanometara i ubrizgam ga u krvotok, on može da prodre u tumor gde ga aktiviraju enzimi tumora da bi otpustio mali signal koji je dovoljno mali da bi ga bubreg isfiltrirao i poslao u urin. Imam signal u spoljnom svetu koji mogu detektovati.