Brenda asks: Since Christmas is coming up, I thought I'd ask a Christmas question. What exactly is a yule log? I know it's a piece of wood, but is there a yule log that is food too?

Brenda, it's a piece of wood AND a Christmas food! Here's a quote from wikipedia about its origin:

The origins of the Yule Log can be traced back to the Midwinter festivals in which the Norsemen indulged...nights filled with feasting, "drinking Yule" and watching the fire leap around the log burning in the home hearth. The ceremonies and beliefs associated with the Yule Log's sacred origins are closely linked to representations of health, fruitfulness and productivity. In England, the Yule was cut and dragged home by oxen or horses as the people walked alongside and sang merry songs. It was often decorated with evergreens and sometimes sprinkled with grain or cider before it was finally set alight.

A yule log can also be a chocolate cake that is made to look like a piece of wood. You can find recipes for them online.

Sources:
http://en.wikipedia.org/wiki/Yule_log
http://cake.allrecipes.com/az/ChocolateDecadenceYuleLog.asp