Positive energy, originally as a term in physics, has been given a new meaning recently and become popular rapidly. In contrast to negative energy, positive energy refers to a kind of healthy, optimistic and vigorous power and emotion, giving us confidence and hope and encouraging us to pursue a happy life constantly. This term is particularly popular on the Internet currently. Large amounts of stories and pictures full of positive energy appear on the Internet frequently. All the vigorous and inspiring people and stories are labeled with "positive energy" by netizens.