This monograph includes four chapters that present recent scientific advancements in dark matter research. Chapter One argues that hydrogen atoms provide the most natural explanation of dark matter. Chapter Two presents possible candidates for dark matter in the context of string theory. Chapter Three proposes simple solutions to the problems of dark energy and dark matter using the theory of general inconstancy and the Bodmer-Terazawa-Witten hypothesis. Chapter Four reviews dark matter as sterile neutrinos and fermions, dark photons, and dark energy, as well as the measurement of the fraction of dark energy density in the universe.