Politico reporter Ken Vogel discovered that the Clinton Foundation has collected as much as $11.7 million in speaker fees from nonprofits. Some argue that celebrity appearances create buzz and more donations for nonprofits, but critics say the high price tags don't produce worthwhile, measurable returns. Do big-name speakers add value to a charity's bottom line or are they just an "empty calorie high?"

A listener poses a moral dilemma regarding aid work; another weighs in on whether the business mindset can improve philanthropy.

Billionaire John Paulson recently gave $400 million to Harvard University. Critics say the money could have done more good elsewhere. Should large donations be scrutinized and debated? Or should we all just be thankful that Paulson is parting with $400 million at all?

How do you figure out exactly what people suffer and die from in every part of the world? Christopher Murray decided to try. His resulting Global Burden of Disease initiative ended up causing controversy among aid groups and large institutions like the World Bank and the United Nations.

Billions of aid dollars were devoted to reconstructing post-earthquake Haiti and fighting Ebola in West Africa. Economist Vijaya Ramachandran and journalist Amy Maxmen tried to track that spending. They found more questions and a lack of transparency.

Graduation season is here, but not all high school seniors are taking the direct route to college. In recent years, some 350 seniors have chosen to put higher education on hold for Global Citizen Year, which offers them year-long apprenticeships in Africa and Latin America. Founder Abby Falik says for most kids in America, college needs to wait.

Abby Falik says high school graduates should immerse themselves in year-long apprenticeships abroad before going to college; Falik's Global Citizen Year is their ticket.

Nepal continues to mourn the thousands who died after a massive earthquake. A global relief effort is now underway to assist more than a million people in need food assistance and other forms of relief. Our guest, Brian Tucker, says responding to crises in this way is shortsighted, costly and poor policy.

Seismologist Brian Tucker says we need to do more than help the victims of natural disasters; we need to prepare vulnerable communities before disaster strikes.

The Center for Effective Philanthropy's Phil Buchanan says nonprofits should push back when the business world says it has the answers to our big social problems.