This week at Tuesday breakfast we served real sourdough pancakes made from my homegrown starter, leavened by the natural yeast that grows in my own kitchen. Strange as that may sound, let me assure you there's yeast in your kitchen, too. And while the whole sourdough process may sound like some bad sixth-grade science experiment, it's actually the oldest way to make yeast-leavened bread. (Unless you managed to scam some yeast from your local brewery, it was the only way until commercial yeast became available in the 19th century.) For all I know it was a sixth-grader who discovered on some pre-biblical hearth that if you started each new baking with a bit of last week's dough, your bread would rise magically in the oven, and would have a more interesting flavor and crumb. But whoever it was, they were on to something, and thousands of years later, this is still the best way to make bread. Or in this case, pancakes. (I'm betting they were just trying to find a way to recycle their leftovers, but it paid off.)