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.
In electronics, it is generally standard to use red wire for positive (+) connections and black wire for negative (-) connections. 1  What other colors you use is largely a matter of choice and will depend on the specific circuit you are building. For example, there are a few different ways you could wire this circuit with red, green, blue, and yellow LEDs, but they will all work exactly the same: