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Optimism. There really is no other way to live life, is there? We look around us and see such beautiful stories that are touching, restore faith in humanity and simply makes life worth living!
1. Health: A host of diseases and medical conditions that were considered to be deadly for almost all of the previous century have been successfully dealt with through vaccinations and other cures! Some of these diseases include Chickenpox, Diphtheria, Malaria, Polio and so on.
2. War: The previous century saw two world wars. World Wars, in case I wasn't clear enough the first time! There weren't many countries not involved in either of these two wars! The way things are going right now, the world will never be plunged into another such war (on such a massive scale).
3. Technology: Technology in various domains just makes life better! Healthcare has largely become far more efficient, surgeries more precise and so on. Education is more widely available, irrespective of boundaries. It is simply easier to learn. In fact, even on Quora we are a community without boundaries. I foresee a world without boundaries one day. A global village if you will! That is what technology can do for us!
Those are just three reasons why today is better than yesterday and tomorrow will be better than today! So in my opinion being optimistic is not insane! In fact optimism is the difference between merely existing and living!