For the child in all of us. 
We spent hours entertaining our toddler child and niece by blowing bubbles. The most beautiful part was seeing the pure joy on their faces, and hearing their innocent, highly contagious giggles.
The best part was when those bubbles would float to random adults in the area. Just seeing how each person burst into smiles or even laughter was so heartening.
We might try to suppress our inner child, but that little one is always ready to make a reappearance. Why fight it?
