Astronomers use the term dark energy to refer to energy in the universe that is unaccounted for by ordinary matter but necessary to explain cosmology. Astronomy, however, isn't the only field with ...

Proteins are vital to living systems. They build and repair tissues, act as enzymes to speed chemical reactions, regulate hormones and transport nutrients—all of which are important for developing ...

Our hearts beat around 100,000 times a day—and do so throughout our entire lives. They draw the energy for this from the mitochondria. As the "powerhouses of the cells," mitochondria produce 95% of ...