each section
of the wing is only as strong as it needs to be. Therefore, the chance
of failure (at least ideally) is about equal anywhere along the wing

In fact, there's a video somewhere showing a stress test on a wing; the
entire wing fails pretty much at the same time.

Jose
--
Quantum Mechanics is like this: God =does= play dice with the universe,
except there's no God, and there's no dice. And maybe there's no universe.
for Email, make the obvious change in the address.