If you don't learn from history you are doomed to repeat it.

Here's the last line of the appendix written by Nobel Prize Laureate Richard Feynman to the Rogers Report on the 1986 Challenger Space Shuttle Disaster:

For a successful technology, reality must take precedence over public relations, for nature cannot be fooled.

The entire text of Feynman's Appendix can be found here.

The front page of the Rogers Report can be found here.