How do you spend that time?
You could try and strike up a conversation with the person next to you (don't do that, you don't know where they've been).
You could sit/walk in silence with no-one but yourself for company (definitely don't do that. You know exactly where you've been).
Or you could download one of these podcasts that will help you get your geek on, learn a thing or to and enjoy yourself while you're at it.
In no particular order, here are my top five podcasts for geeks.
My all time favourite educational podcast. Dan Carlin looks at historical events with an unconventional perspective that puts some of the emotion back into history. His episodes dealing with Gengis Khan and the effect that the Mongol Empire had on the people living within its lands, and his "Blitz Editions" take a look at overarching topics ranging from historical drug use to globalization.
Carlin does a hell of a lot of research into any topic he sinks his teeth into, which explains why each episode takes a few months to make (it's well worth the wait).
A fairly new podcase, but immediately came one of my top podcasts. Nights at the Round Table sees a group of geeks in a pub waxing lyrical on everything from Star Trek to Gremlins to kaiju movies to Labyrinth and everything else that makes geeks happy.
What I like best about this podcast is that it's by fans, for fans. These guys have a passion for all things geeky, and it really shows.
Podcastle / Escape Pod / PseudopodThese three podcasts are together as they're sister casts of one another, but they all scratch the itch of the speculative fiction geek. If fantasy is your flavour, you'll find short fantasy audio stories in Podcastle. For the sci-fi geeks, check out Escape Pod. And if you like a touch of the eldritch in your stories, give Pseudopod a listen.
As well as original short stories by breakthrough authors, they also contain expanded world stories from big names in speculative fiction.
Most of the kudos to this podcast is that it introduced me to Dan Carlin's Hardcore History. Hosted by John Joseph Adams and David Barr Kirtley, Geek's Guide to the Galaxy combines geeky chat with interviews from writers and other podcasters to give listeners an introduction to geeky horizons that you wouldn't expect to see.
A must for any aspiring writer. Hosted by Brandon Sanderson and Howard Taylor, each episode looks at a different aspect of the writing craft, from working out character deaths and fixing plot holes to tips on expanding your story to encompass multiple novels.
This is an essential, quick fire podcast for anyone who wants to write speculative fiction from some of the best names in the genre.