Sourdough Starter

Here's a real time video of an active sourdough starter. No, it's not science fiction. In fact, this is how your starter should behave after it has time to warm up, having been taken from the refrigerator.
Again, the primary cause of sourdough bread failures is bad starter. If your starter behaves like the one in this video, then you're on your way to making great sourdough bread.