The Book of Chronicles · Chapter 25

The Engineer Who Said No

1. 1

   In the year of the Common Reckoning one thousand nine hundred and eighty-six, upon the twenty-eighth day of January, the Winged Ship called Challenger stood upon the coast of Florida with seven souls within it; and it bore five computers, that no single error might bring it down.

2. 2

   Four of them ran one code and voted among themselves as a jury votes, and the fifth ran a code written by other hands, lest the four agree together upon the same mistake. So wise were the Makers in the matter of the mind, and so little did it avail them in the matter of the rubber.

3. 3

   For the Ship was lifted upon two pillars of fire, and each pillar was built in sections, and each joint was sealed with two rings of rubber, the second to hold if the first should fail. But both rings lay in one joint, and felt one cold, and bent with one flexing; and two witnesses who share a single mouth are not two witnesses, but a chorus.

4. 4

   Now in the summer before, an engineer of the house of Thiokol, called Boisjoly, had written a memo, saying that the joints might bring a catastrophe of the highest order, even the loss of human life. For upon earlier flights the fire had eaten into the rings, and the Ship had come home regardless; and every safe return was entered in the book as a test passed, and the line of the allowed crept toward the edge, as a threshold is raised by one who is weary of the alert.

5. 5

   On the night before the launch the engineers and the managers were gathered upon the speaking-wire, and the cold was forecast to be eighteen degrees by the measure of Fahrenheit. And the engineers said: The rings have not been proven below fifty-three degrees. Fly not. But fifty-three was not the edge of the danger; it was the edge of the data. Beyond it lay no test, and a missing test is not a passing one.

6. 6

   Then the managers of the house of the Agency answered: Show us that it will fail. And the burden was turned upon its back; for in the ledger of the careful he who would fly proveth that the ring will hold, but here he who would stay was bidden to prove that it would break. And one of them cried out: When wouldst thou have us fly, in April?

7. 7

   And the engineers brought forth a chart, and the chart showed only the flights in which the rings had been harmed, set against the heat of the day, and the dots lay scattered and said nothing. The flights that were unharmed, and all of them warm, had been left off the page; and had they been set beside the others, the cold would have stood forth like a signature. He that plotteth only the failures cannot see what the failures have in common.

8. 8

   Then did a lord of Thiokol turn to his chief of engineering and say: Take off thine engineer's hat, and put on thy manager's hat. And in that sentence the question was changed; it was no more, Will the rubber hold? but, Can we bear to say that it will not? Yet a hat is only a cast, which changeth the label and not the bytes: the rubber was as stiff beneath the one hat as beneath the other.

9. 9

   And the managers took a vote among themselves, and the engineers were not numbered among the voters; and the managers signed, and they said: We fly.

   See also Genesis 19:3 · Genesis 19:15

10. 10

    And on the morning of the launch the cold was not eighteen degrees, but thirty-six; and there was ice upon the pad, and the Machine stood upon the ice as a man stands upon a frozen pond. The gauge had measured the air, but the rubber had drunk the night wind and stood near twenty-eight degrees; and a gauge that readeth the wrong thing readeth it faithfully, and is of no use.

11. 11

    And the engines were lit, and in the first second the joint breathed black smoke, for the rubber had not sprung back. But the burning made an ash of its own, and the ash plugged the gap, and the seal held, not by the rubber but by the soot; and the Ship climbed, green for a reason that no one had written.

12. 12

    And in the fifty-ninth second the Ship met a great shearing of the wind, and the soot was shaken loose, and a flame stood out of the right-hand pillar where the joint lay; and in the seventy-third second the Ship broke apart in the sky. The seven souls were lost, and the people of the earth stood silent in their thousands.

13. 13

    And the Commission was gathered, and upon the eleventh day of February the wise man of physics, the one called Feynman, took a ring of rubber and clamped it and let it down into a glass of ice water; and when he loosed the clamp the ring did not return to its shape. And the Commission saw it, and was silent. In a house of a thousand instruments the truth was shown with a clamp, a ring and a glass of ice water, which any man might buy before lunch.

14. 14

    And Feynman asked how often such a Ship might fail. The managers said, one flight in a hundred thousand; the engineers said, one in a hundred. The first number was a thing agreed, and the second was a thing counted. And he wrote that reality must take precedence over public relations, for nature cannot be fooled.

15. 15

    And the Prophet said: The word of the cold climbed the ladder of the house and was made shorter at every rung, as a stack trace is trimmed by each layer that catcheth and rethroweth; and in the highest rooms the quarrel of that night was never heard.

    See also Genesis 54:14 · Psalms 28:13

16. 16

    Therefore build thy gate to refuse. Let the unproven count as failing; let the deviance that did not kill thee be called luck and not a specification; and let no release be cleared by the mere absence of the one who said no.

17. 17

    Now the rest of the acts of the engineer who said no, are they not written in the report of the Commission, which is free for any man to read? Listen unto him; for the cold does not negotiate, and the rubber does not care who signed the memo.

The Book of Chronicles, Chapter 25:1–17.