Stephen Hawking, the legendary physicist who tried to unlock the secrets of the universe, would have turned 78 today. The scientist, despite suffering from Amyotrophic Lateral Sclerosis, an incurable degenerative neuromuscular disease, did not let anything come in his way of pursuing his passion. He not only explained his theories on exploding Black Holes in lucid language, but also wrote the best-seller titled "A Brief History of Time'. We recall some of the quotes by the great scientist and genius here.