Science Podcast - Replacing the Y chromosome, the future of U.S. missile defense, the brightest gamma-ray burst, and more (22 Nov 2013)
![Science Magazine Podcast show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/030/790/small/science-magazine-podcast.jpg)
Summary: The minimum requirements for a Y chromosome with Monika Ward; Eliot Marshall checks in on U.S.'s missile interception program 30 years later; Sylvia Zhu breaks down observations from the brightest gamma-ray burst.