Fantastic failures

Most failures are not single-point; generally a single event does not entirely account for the failure. Often multiple problems interact to precipitate the failure. Multiple initiating events and unforeseen circumstances usually combine to force the system into regions of complexity that the human mind cannot easily predict or even comprehend. Non-obvious use and improper operation can lead to failure. This paper(a must read) looks at various events in history where multiple problems lead to catastrophic accidents.