 All Things Considered is supported by the University of Minnesota Foundation. Your gifts advance research on how we can live healthier, longer lives. More at give.umn.edu slash NPR. It's All Things Considered from NPR News. I'm Scott Detrow. And I'm Ari Shapiro. One of the rarest whales in the world washed up this month on a beach in New Zealand. Scientists say it's a window into the mysterious life of the spade-toothed whale, and we will have more on that in a little while.