"I was certainly aware that this was a culmination of the work of 300,000 to 400,000 people over a decade."

"The unknowns were many, but our confidence was high."

"I think the one thing that I would say is that we truly weren't ready for what we saw."

"Pilots take no special joy in walking. Pilots have a distaste for walking."

"Science has not yet mastered prophecy. We predict too much for the next year and yet far too little for the next 10."