Ashley Olsen and her twin sister Mary-Kate Olsen were professional actors before they could speak. A TV executive held the twins in his arms when they were three or maybe nine months old (accounts vary), and neither girl cried. On the basis of this audition, the Olsen twins landed the shared role of baby Michelle on Full House, when they weren't even toddlers. They were nine when the show finally ended.
Recall the relationship between the forward and reverse reaction rates when a reaction is at equilibrium. In a chemical equilibrium, the forward and reverse reactions occur at equal rates, and the concentrations of products and reactants remain constant.
Exothermic and endothermic reactions both cause some type of energy level differences. In an exothermic reaction, energy is released in the form of heat. As chemical bonds are formed, energy is released. An example is water turning into ice. Chemical bonds form and release energy to create ice crystals. An endothermic reaction, however, is the opposite. Here, the energy is absorbed in the form of heat. When a chemical bond is broken, the energy used creates an endothermic reaction. Changing ice into water, then vapor, requires the chemical bonds to be broken.