Imagine you're on a backpacking trip high atop the Sierra Nevadas. You were dying to test out your amateur photography skills but in the rush of getting ready for the trip, you forgot to charge the camera's battery.

Now you'll have to ask someone else to share their photos, but they won't be as good as yours. And they may not even get around to sending them to you. But wait...you did bring that Mountain Dew!

Professor Martin Tangney Talks About Whiskey Biofuel.