The world is 4 million teachers short. Here's how to solve that.

Lack of reading material is not only a third-world problem – many poor families in the United States lack access to and funds for books. A program that helps get books to into the homes of low-income families can boost literacy, and help publishers, too.

How can rural African children learn to read when there are no books in their languages? Save the Children helps kids to create their own books, creating a homemade library for their village.

Delaware has been working to make sure that all college-ready graduates, regardless of socioeconomic status, make it to college. With financial reasons standing in the way of many qualified students, the state has worked on multiple levels to make this a possibility.

PowerMyLearning, a program that any student, parent, or teacher can use for free, helps students take ownership of their own learning. When most attention is being placed on teacher effectiveness, this program redirects those efforts toward students.

Education is far from a given for poor, rural Africans. But a group called Camfed is bringing lasting social change to African countries by educating hundreds of thousands of girls.

The overall graduation rate for black male students in New York City was 58 percent in 2014 - student retention rates are equally poor. But one school achieved a 100% on-time graduation rate last year, motivating their students with a student-founded, student-sustained 'fraternity'.

Attending college is not always a given option for gifted teenagers from less-than-wealthy backgrounds. National organization QuestBridge creates a way for low-income and minority high-achieving students to go to their dream colleges free of cost.

Why do schools teach music in a way that turns off so many young people rather than igniting their imagination? A program that taps into students’ passion for pop and rock is revitalizing music education in many schools.

Overall, Cambodia is a relatively poor country whose residents don't own much. Norwegian hotel owners in the city of Krong Siem Reap urge their Cambodian staff to be more in charge of making their own decisions by making them co-owners of the hotel, an act that forced them to have more confidence and critical thinking skills.

For-profit companies are making good private schools available even to Africa’s poor. They can do it – and can do it on an enormous scale – by hiring neighborhood residents to teach, and scripting out every word of every lesson on an e-reader.