Weightless is a great equalizer.

It's easy to sleep floating around - it's very comfortable. But you have to be careful that you don't float into somebody or something!

For a long time, society put obstacles in the way of women who wanted to enter the sciences.

Studying whether there's life on Mars or studying how the universe began, there's something magical about pushing back the frontiers of knowledge. That's something that is almost part of being human, and I'm certain that will continue.

When you're getting ready to launch into space, you're sitting on a big explosion waiting to happen.

There are lots of opportunities out there for women to work in these fields, ... Girls just need support, encouragement and mentoring to follow through with the sciences.

Yes, I did feel a special responsibility to be the first American woman in space.