I knew that I could never meet Keats's standard, even as I knew that all my “ansioers” might eventually be proven wrong. I took solace, once again, in Francis Bacon, who praised error, because only from wrong answers can the Truth emerge.—Robert Kaplan, 1996

Our whole problem is to make the mistakes as fast as possible.

—John Wheeler, 1956

Now that the long-awaited M6 Parkfield earthquake (28 September 2004, 17:15:24 GMT) has occurred, a summary of what hypotheses the “Parkfield Prediction Experiment” (PPE) was designed to test is in order. This is particularly true since many years have passed...

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