I stumbled across an interesting current event on the Popular Science website that I thought some of you might be interested in.  It details the best science related podcasts that are available for free download online.  Here's where you can find the post:

http://www.popsci.com/technology/article/2012-02/best-science-podcasts

If you're not familiar with podcasts, they are basically free radio-style programs that you can download to your computer or to your iPod.  They can be super informative and are almost always free.

While I haven't had a chance to check these podcasts out myself yet -- so I'm not sure if they will be interesting or appropriate for your kids -- I'd bet that there's content here you will like if you are a science driven person.

Hope this helps,
Bill Ferriter