Eric Westervelt

For Ross Roberts, it was a lack of resources that drove him from the classroom. For Danielle Painton, it was too much emphasis on testing. For Sergio Gonzalez, it was a nasty political environment.

Welcome to the U.S. teaching force, where the "I'm outta here" rate is an estimated 8 percent a year — twice that of high-performing countries like Finland or Singapore. And that 8 percent is a lot higher than other professions.

It's 8:30 a.m. and the sun is already heating up the artificial turf at Banning High School's football field. Some 70 ninth- and 10th-graders line up on their stomachs for push-ups.

For some of these kids, the "push-up ready" pose looks like a cross between an aborted yoga position and a nap.

"Come on! Butts down, hips off the ground, shoulders over your hand!" barks Los Angeles Fire Capt. Eddie Marez.

"Down!"

"One, sir!" the sleepy students shout.

"Didn't say 'up' yet. Start all over!" Marez yells.

New community college student Asia Duncan makes her way to class up an outdoor stairwell on the sun-filled campus of Pasadena City College in southern California.

"I'm actually headed to an 'Intro to College' class," she says. "They're teaching you about college and what's a unit."

It's a class about taking classes?

"Exactly," she says, "It's telling me where on campus I can find different resources. So some of it is helpful."

The resources Duncan needs most now may not be things the school can help much with: childcare and income.

The good news: There's an uptick in the hiring of new teachers since the pink-slip frenzy in the wake of the Great Recession.

The bad news: The new hiring hasn't made up for the teacher shortfall. Attrition is high, and enrollment in teacher preparation programs has fallen some 35 percent over the past five years — a decrease of nearly 240,000 teachers in all.

Parts of most every state in America face troubling teacher shortages: the most frequent shortage areas are math, science, bilingual education and special education.

"Never forget" became a national rallying cry after the attacks of Sept. 11, 2001.

Yet America's schools — where collective memory is shaped — are now full of students who never knew. Because they weren't alive 15 years ago. As such, many teachers struggle with whether and how to teach the attacks and their aftermath.

According to one survey, only about 20 states include anything in depth about the events of that fateful day in their high school social studies curriculum.

And when they are taught, critics say, it's often through a narrow lens.

Recent studies and government reports continue to highlight what many American's know by their wallets: Rising income differences, debt and stagnant real wages are among the biggest problems besetting the nation.

That economic inequality is reflected in America's schools, right? Absolutely.

I was reporting recently on the challenges the DIY "maker movement" faces as it moves into more classrooms, when I flipped through a copy of new book, The ABCs of How We Learn: 26 Scientifically Proven Approaches, How They Work, and When to Use Them. It's based on a popular course at Stanford University.

Hmm, M is for Making.

Take a look this summer inside some of America's garages, museums and libraries and you'll see that the "maker movement" is thriving.

This hands-on, DIY culture of inventors, tinkerers and hackers is inspiring adults and children alike to design and build everything from sailboats and apps to solar cars.

And this fall, more of these chaotic workspaces, stocked with glue guns, drills and hammers, will be popping up in schools, too.

But the maker movement faces some big hurdles as it pushes into classrooms.

Here's the first big one:

Most everyone knows someone adversely affected by student debt: More than 40 million Americans are shouldering a crippling $1.3 trillion in loans.

That burden is obstructing careers, families, dreams, employment and even retirement.

Uncle Sam and Wall Street have made lots of money off the crisis.

After some 10,000 online tutorials in 10 years, Sal Khan still starts most days at his office desk in Silicon Valley, recording himself solving math problems for his Khan Academy YouTube channel.

"OK, let F of X equal A times X to the N plus," he says cheerfully as he begins his latest.

Khan Academy has helped millions of people around the world — perhaps hundreds of millions — learn math, science and other subjects for free.

Some college lectures aren't just dull, they're ineffective. Discuss, people.

You did. Our recent stories on the Nobel Prize winning Stanford physicist who's pushing for big changes in how large universities teach science to undergraduates generated lots of interest, comments, questions, shares and listens — online and on NPR One.

Bloodletting to keep the "humors" in balance was a leading medical treatment from ancient Greece to the late 19th century. That's hard to believe now, in the age of robot-assisted surgery, but "doctors" trusted lancets and leeches for centuries.

To Nobel laureate Carl Wieman, the college lecture is the educational equivalent of bloodletting, one long overdue for revision.

Copyright 2016 NPR. To see more, visit http://www.npr.org/.

John B. King Jr was recently confirmed by the Senate as the new U.S. Secretary of Education for the remainder of President Obama's term, succeeding Arne Duncan.

With a slew of pressing issues from pre-K to college debt, I wanted to find out what King thinks he can get done in such a short window of time. Here's our conversation.

Kelly Henderson loves her job, teaching at Newton South High School in a suburb west of Boston. But she's frustrated she can't afford to live in the community where she teaches: It's part of the 10th most expensive housing market in the nation.

"For people in the private sector, they're probably saying 'Oh poor you, you can't live in the community where you work, what's the big deal?' " says Henderson, 35. "And I guess part of the nature of public education and why it's a different kind of job, is that it's all-consuming — as it should be."

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