1. Smile.

"Smiles are contagious and the simple act makes people feel better," writes Dinsmore. Carnegie goes one step further: "The expression one wears on one's face is far more important than the clothes one wears on one's back." Carnegie even cites an old training program that phone companies provided to teach selling over the phone. "They suggest you smile when talking on the phone," he writes. "Your 'smile' comes through in your voice." 

An action that is simple yet so powerful...and so underutilized.

Every day gives us opportunities to practice smiling.