Diwali! The festival of lights of India. But like Diwali, there are number of festivals all over the globe. Like Christmas, or Easter, or Ramadan, and so on. But on this day of Diwali, I had a thought. Why do people all over the world celebrate something or another? Why do people have this immense need of coming together and celebrate an occasion which may or may not have any significance in past? Here is my understanding on this subject. But before going in the festival part, here’s little about human behavior. I think any human being is just another machine made up of atoms and molecules. Now for any machine to work in a specific environment with multiple variables, it has to have a feedback mechanism. We all have input sensors, like eyes and ears. Then the input is fed to processing part of the machine, our brains. And then we take actions with the actuators, like hands, mouth. Basically we provide an output. And here’s how a feedback mechanism works. If your action gives...