When will I need that?

The transition from childhood to adulthood involves the following realisation for too many.

Child in Maths class: "When will I need to use that in the real world?"

Teacher: "blah blah bla bla bla blah." ( that's what child hears.)

Child now an adult: "Good God you need a degree to understand this." (Adult trying to read a timetable, buy a light bulb in B&Q, or understand debt management.)

Unfortunately the people that need to invent a time machine just aren't clever enough.