Podcasts are a good way to learn about a myriad of topics while stuck in traffic! I access LLVLC podcasts the iPhone podcast app and you can also listen online.
They are free and the audio has commercials at the beginning, midway and end but I did not find them annoying at all (fewer than what you would get on regular radio). Here are two good ones that I listened to recently:
“What happens if you give people insulin? Do they take a couple hundred units of insulin daily for two weeks and then take themselves off of it? That never happens!” — Dr. Jason Fung
“At the root cause of all disease is inflammation–cancer, cardiovascular disease, diabetes, obesity. If we can find out the cause of that inflammation, then we’re on the very first step to prevention. And maybe we’ll get a new handle on modern disease.” — Dr. Gary Fettke