For those of you who haven't read our regular feature, Letter From Langdon, you don't know what you're missing. Check out the feature below and to the left — or just search for Langdon up above and start reading. You won't want to stop.For those of you who are familiar with Richard Oswald's magical missives from his farm in the far northwest corner of Missouri but have wondered what the guy sounded like, here's your chance. Richard (above) was on the Marketplace radio show this morning with a commentary. Just click this sentence to go to the show for a listen. Marketplace is running a series called "Food Fight." It's about the global rise in food prices and the food shortages that are causing havoc around the world. Richard talks about this from the perspective of a farmer who has waited a long time to earn a decent return on his labor and investment. Listen up.