“The truth is, every single rocket launch off of planet Earth is risky.” — John M. Grunsfeld Quote

“The truth is, every single rocket launch off of planet Earth is risky.”

“We're being very careful that we don't send a spacecraft to Mars with the intention of detecting Martian life - and find out that we detected the Earth life that we took with us.”

“I was not really scared on my spacewalks. We practice so much and need to stay so focused that it has a calming effect on me. I do a kind of visualization and meditation in the airlock prior to going outside, to guide my first activities once I get out in space.”

“It's like this: The time between having an idea and its public launch is measured in days not months, weeks not years.”

“You launch a site, and you see what works, and you continue to make it better.”

“I never had a plan. I have to say, I'm very shocked when people start a company and say, 'In five years I want to launch a perfume, or in 10 years I want to have this.' How can you know?”