Short Wave Folgen

NPR science correspondent Dan Charles explains why most of the dairy cows in America are descended from just two bulls, creating a lack of genetic diversity that can lead to health problems. He also visits a lab at Penn State University where scientists are trying to change that. Follow reporter/host Emily Kwong on Twitter @emilykwong1234. Email the show at shortwave@npr.org.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

A lot of the stuff we buy in the U.S. comes by ship — ships that use a particularly dirty kind of fuel. Now a big shipping company says it wants to go zero carbon. Climate reporter Becky Hersher tells us how some old tech might play a role and where that tech falls short. Follow Maddie on Twitter @maddie_sofia. Email the show at shortwave@npr.org.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy

Helium is the second-most common element in the cosmos, but it's far rarer on planet Earth. As part of our celebration of the periodic table's 150th birthday, reporter Geoff Brumfiel shares a brief history of helium's ascent, to become a crucial part of rocket ships, MRI machines, and birthday parties. Follow host Maddie Sofia on Twitter @maddie_sofia. Email the show at shortwave@npr.org.Learn more about sponsor message choices: podcastchoices.com/adchoicesNPR Privacy Policy