[redpoint5]

Plane crashes fascinate me because it's almost always a series of highly unlikely events that leads up to a fantastically unlikely crash, yet they happen. Many, if not most, could have been easily prevented by the pilot "flying the plane", or at least relying on alternate instrumentation to determine the state of the aircraft.

I'll have to watch later when I've got more time.

The radiation therapy machines at hospitals used optical sensors to determine position, but fuzz would end up fouling up the sensor and cause a fault. They are being replaced by hall-effect sensors, which should improve uptime.