Ever Wondered Why the Two Sides of a Coin are Called 'Head' and 'Tail'? 

Let's hear a 'tail'. 

I read an excerpt written by Lt. Col. (Dr.) Pramod Deogirikar, and the question why are we still tossing an 'outdated' coin till date is now stuck in my mind. 

Why do humans agree with what has been told to them? Why don't we try to find the answers to the questions that have never been asked? 

My wayward thoughts further encouraged my curiosity and I typed, "Why are two sides of a coin called 'head' and 'tail' on Google, and kept on looking for answers. There were many pages, links and people who had an answer to this question and here is what I could manage to understand: