To support mathematics, science, engineering departments, business schools and med schools.
Now, ask why humanities and social science departments, law schools and colleges of education are necessary? Darned if I know--it isn't as if students even learn to write decent papers any more. I know, I sometimes assign term papers in math courses for ed majors or my occasional course on cryptology (or for extra credit in some others), and what you'd expect by way of an education from the humanities is sorely lacking.