Being the only child is a unique position in a family. Without any siblings to compete with, the only child monopolizes his parents' attention and resources, not just for a short period of time like a firstborn, but forever.
Like gravity and plate tectonics, evolution is a scientific theory. In science, a theory is the most logical explanation for how a natural phenomenon works. It is well tested and supported by abundant evidence. It means quite the opposite from our informal use of the word theory, which implies an untested opinion or guess. As a scientific theory, evolution enables scientists to make predictions and drives investigations that lead to new kinds of observable evidence.
Mad scientist. A mad scientist or mad professor is a scientist who is considered mad Ã¢â¬â a synonym for insane. The mad scientist may be villainous or antagonistic, benign or neutral; may be insane, eccentric, or clumsy; and often work with fictional technology or fail to see potential objections to playing God.