You'll find the NPR directory here:
http://www.mediafly.com/Areas/NPR/FeedsTo make things simple, it's very worthwhile to [link]
download Apple's free 'iTunes' . In my opinion, this is exceptionally good software. It's a first rate way to find and download audio and video podcasts. You can use it to browse the 'iTunes Store' where you can subscribe to any of hundreds of podcast feeds (including NPR):
Here are a few of the dozens of science podcast sources:
SETI Institute "Are We Alone?" -
http://radio.seti.org/listening-options.phpAstronomy Cast -
http://recap.ltd.uk/podcasting/sciences/astronomycast.phpAstronomy Magazine -
http://www.astronomy.com/asy/default.aspxCERN -
http://www.cernpodcast.com/IRrelevant Astronomy -
http://www.jodcast.net/amp/irrelevant.html?num=irrelevant_5NOVA E-mc2 -
http://nova_e-mc2.vitalpodcasts.com/NOVA Science Now -
http://www.pbs.org/wgbh/nova/sciencenow/rss/