Axios

At least 100 million Americans have some sort of medical debt. But, the group with the highest rates of medical debt might surprise you.

The big picture: Nearly 1 in 4 middle-class Americans, people who earn $50,000-$100,000 a year, have unpaid medical bills, according to a new report from the think tank Third Way. We take a look at why middle-class Americans have the highest rates of medical debt.

• Plus, we follow our teacher shortage reporting with teachers' own stories.
• And, a lack of bus drivers adds to the back-to-school chaos.

The school year is once again beginning without enough teachers. Turnover rates are high and fewer young people want to go into the profession.

The big picture: According to research from Kansas State University's College of Education, there are more than 30,000 teacher vacancies in the U.S., and more than 160,000 jobs are filled by teachers who aren't qualified. Axios' Erica Pandey shares what states and districts are doing to try to solve this persistent problem.

• Plus, a rare and dangerous West Coast tropical storm.
• And, more Americans are falling behind on credit card payments.