Unintended consequences

This is a fascinating TED talk on Unintended Consequences by Edward Tenner.  He describes several examples of unintended consequences throughout history.  One that caught my attention was the destruction of tape drives because of the tin in the biocide for cooling tower water.  Mr. Tenner suggests that we take advantage of the information from the unintended consequences because "Chaos Happens."  We need to be less critical of mistakes that we do not intend to happen because they can make our lives better.