B. Karthika beautifully expressed that a smile is the best curve in life because it has the power to make everything better. She said that when we smile, we not only make ourselves happy but also spread positivity to others. A smile can solve problems, build friendships, and bring peace to the heart. It costs nothing but gives so much joy. She reminded everyone that no matter what happens, we should always keep smiling — because a smile is the simplest way to brighten someone’s day and make the world a happier place.