(Prerequisite, permission of instructor.) A special course for graduate students who have had a minimal background in physics, chemistry or the earth sciences but who need training in one of these fields. A student may be permitted to enroll in PS 500 more than once but will not be allowed to accumulate more than 6 hours credit. See the chair of the department for details. *The blank will be filled in with an appropriate short description on the student's transcript to indicate the subject area studied. Permission of instructor required to enroll.