So you're sitting in your car at that intersection, waiting for the light to change from red to green when you think, “Hmm, why green? Why not blue or purple? Why are things colored the way they are — and how many ways can you answer that question before this light changes?  Did you know, for example, that before 1905, taxis were red and green? Then, Albert Rockwell introduced a model with a 15-horse-power engine that became the standard. He painted it in yellow because… his wife liked that color! And maintaining marital bliss is a good reason for anything! 

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