My number-one criteria in making these decisions was simple -- who is going to do the best job in securing America.

WHITEHOUSE: The White House

But that's, you know, two, three years away, what I want to do is to get the industry now to focus on a simple job which is to provide a railway network which is safe, which runs on time and which is comfortable for the travelling public.

BBC: News Online

In the case of the Challenger, the culprit was a simple O-ring that had become too brittle to do its job after a freezing night waiting on the launch pad.

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