Something so small it can't be detected by any microscopic means, but still gives off a presence. Interacts with light/gravity in a way that simply teflects its own arpeture. Like a camera. Is possibly the indication of a biological entity, unseen.
Doctor, the anti-nano mechanism is rejecting the path of least resistance.
Prepare for biopsy.
Blood levels levelling...we have boiling point.
Excellent work doctors.
Pop! Ssszzzzz!