The problem is not with the Catholic church teaching, the problem is with us in the rich nations who do not share our wealth with the poor people in developing countries.

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Brazil compounds the problem by training teachers in neither subject matter nor teaching skills (they learn about the philosophy of education instead).

ECONOMIST: Education in Brazil

The problem with this is that, while it provides a strong incentive for experienced teachers to stay in teaching longer than they might otherwise, it makes teaching unattractive to young people who are more concerned about supporting new families than about their retirement.

FORBES: Reforming Teacher Pay to Attract New Teachers

With virtually no state schools providing adequate teaching in science or maths, he says, the country has added to its vast problem of unemployment (every other 18-24-year-old is out of work) a no less vast problem of unemployability.

ECONOMIST: White flight from South Africa

The mayor of Shanghai, China -- a city of over 20 million people -- told me that even in such a large city, they had no problem recruiting teachers in whatever subject, but particularly math and science, because teaching is revered and the pay scales are comparable to professions like doctors.

WHITEHOUSE: Honoring Educators in Math and Science