An estimated 40 percent of Americans with student debt have not completed a four-year college degree. Hank Green, vlogger, entrepreneur, cofounded Study Hall to change that. The online learning platform will offer individual college courses, accredited through Arizona State University, allowing students to earn transferrable college credits without enrolling in college or setting foot on campus.

In the latest Higher Voltage, Green explains why this is essential to tackling the student debt crisis and making college more accessible.