Chronic stress has been widely implicated in a plethora of lethal and life-altering diseases including diabetes, heart attacks, depression, Alzheimer's and osteoporosis. Thus, there is great interest in monitoring stress levels in the population. Stress has both biochemical and physiological effects on the body that can be quantified in bodily fluids....

Many products, such as medical devices, need a unified way of encoding uniquely-identifying information that can be easily accessed. This can provide traceability to specifications, lot numbers, recalls, etc. This applies to medical devices both in and out of the body as well as many consumer goods. Common codes, such as a UPCs, can only be read if...