Safety First: Or Why I Never Bitch When We Call A Hydrogen Halt

Sometimes the smallest things can cause the worst
Of problems, when they leak from where they ought
Rather than vent, controlled - such as the first
Of all the elements. Lest you forgot,
That's Hydrogen, the smallest, simplest one,
But one that can explode with quite a bang
(As when the Hindenburg came quite undone).
I'm glad, therefore, that NASA's ground crew gang
Discovered on Endeavor such a leak
As paused Discovery some months ago
Until all was put right. Yeah it's some streak
Of luck we're having, but it must be so.
Th'alternatives are not to be allowed:
Retreat or tragedy? Not what we've vowed.