Some critics say that ending polio has become Bill Gates' "white whale."
Why not just settle for the huge drop in polio cases that we've seen over the past decade and then spend money on other things that kill so many more kids, like diarrhea and malnutrition?
"Polio is special," Gates tells NPR's Robert Siegel on All Things Considered. "Once you get it done, you save $2 billion a year that will be applied to those other activities. There's no better deal economically to getting to zero."
It's easy to hear the steady growth in the music of Phosphorescent's Matthew Houck since the release of his band's 2009 Willie Nelson tribute album, To Willie. In 2011, Here's to Taking It Easy was a sprawling, languid epic written with his road band's performances in mind.