Authors:

The Columbia accident made us realize that we had been playing Russian roulette with the shuttle crews - that we had been very, very fortunate in the past that the foam did not cause critical damage.

"NASA mulls threat from protrusions". www.cnn.com. August 1, 2005.
The Columbia accident made us realize that we had been playing Russian roulette with the shuttle crews - that we had been very, very fortunate in the past that the foam did not cause critical damage.