Tuition and other expenses have gone up so much there's now a consensus that higher education costs too much, at the same time it's more necessary than ever. Two-thirds of students are taking out loans, and collectively owe a trillion dollars — more than the total of credit card debt. Do the loans themselves allow colleges to spend more than they need to? Why are public universities also charging much more? Will cheap, online courses now offered by Stanford, Harvard, MIT and Google transform the college experience and make campuses obsolete? We hear from educators and a graduate who owes $55,000 in student loans.