It’s Sheldon Cooper's birthday today and we can’t celebrate his special day without celebrating his popular Big Bang Theory character Sheldon Cooper. The Big Bang Theory is one of those TV series we watch to feel comfortable. It is amazing how a series essentially about science, scientists and theories, turned out to be so much fun that even though its last episode aired on 16 May 2019, the fans still go back to the series and watch the whole thing again and again.