If you like numbers, then you'll like this one: Humans achieve 7 9's of reliability when driving a car, as measured for fatalities by time, or 8 9's if you measure by miles.
I've yet to see a computer just stay up that long, never mind actually doing anything the whole time.
(If you use the collision rate instead, the numbers are about 500 times worse - but that's still quite a lot of 9's.)
People have this fixed thought that humans are terrible drives. They are not! Computers have their work cut out for them to exceed the reliability record humans have set.
