Early diagnosis of a heart attack may now be possible using only a few drops of saliva and a new nano-bio-chip, according to new research. The nano-bio-chip assay could some day be used to analyze a patient’s saliva on board an ambulance, at the dentist’s office or at a neighborhood drugstore, helping save lives and prevent damage from cardiac disease. The device is the size of a credit card and can produce results in as little as 15 minutes.