The Limits Of Human Endurance
How do you study the upper limits of human endurance? Professor Herman Pontzer of Duke University tracked long-distance athletes running across the country. He talks with NPR's Lulu Garcia-Navarro.
NPR's Joe Palca reports that legislation that kept the federal government open also restricted funding of research on human embryos. Opponents of the research say it is unethical. But proponents say it could lead to important understanding that could help improve fertility treatments.