Sources here   I like yellow. In fact, I love yellow! (and red and red with white polka dots and white, but today it's about yellow so let me focus for once!)One of my teachers used to say "if it weren't for different opinions, what would happen to yellow?". Needless to say I never quite got why yellow had been singled out for this insightful yet quite mean thought about said colour. And that made me like yellow even more (we all love an underdog, really!).   Yellow has a smile attached. Typically mine. Frequently other people’s – sunshine is…