You have some sense of what the wires going to and from your computer do. Some bring power; others transmit information from one device to another. But some of these cables look a bit...off.
Diabetics may have yet another tool in their blood-sugar management arsenal — an implantable, fluorescent blood-sugar monitor. It involves small hydrogel beads that vary the intensity of emitted light depending on glucose concentration. They're called Life Beans.