Speaking of movies to watch and Senna's death. The documentary, "Senna" is available on iTunes. I thought the scene where Jackie Stewart (who had become known as a racing safety advocate by then) was interviewing Senna and questioning his somewhat aggressive driving style was pretty interesting. Senna wasn't having any of it and basically was dismissive of his questioning. On the other hand, however, I was a bit cynical about how they glossed over the cause of his accident as "unknown"--that just doesn't cut it for a documentary.
There has never been an official cause listed for the crash. There was most likely a failure in the steering because he made no effort to turn whatsoever.