In 2010, worldwide sales of Plavix topped $6 billion (yes...billion!). For a typical stent patient, one 75mg tablet of brand-name Plavix a day cost more than $210 a month. Those with drug-eluting stents (80% or more of patients) generally must take Plavix for a year minimum.
Delving deeper. Yes, there is a color feeling connection in preschool aged children. Red is mad, blue is sad, yellow is happy and green is glad. This commonsensical approach to tying primary colors with basic feelings is effective for young children.
To the signals that flow through them, nothing. The signals can't see the colors. However they are to help trace or identify the wires to the people assembling testing and repairing them. The color codes vary wildly. For DC circuits, red and black mean positive and negative, most usually the power wires. For AC circuits, the mains wiring have certain preferred colors - Blue and brown and green with yellow stripe are Neutral and hot and ground colors mandated by current EU regulations.