Think back to when you were in college. (For some of you, it may not be very difficult). What do you do when you encounter a food product that has been a member of your household long enough that the memory of its acquisition has taken its place alongside the name of your first grade teacher among the mists of dubious recollection? If you're like me, you leave it there until it undergoes an alarming change of physical state.
But if you're an engineering student, you take a different tack.