It's good to have a fear of heights. I mean, it's kind of crazy not to because if you just lean out a little bit and there's a gust of wind or somebody bumps you or something and you fall, you're splat.

It’s not enough to shelve your own competitive streak. You have to try, consciously, to help others succeed.

For the last several years and culminating in six months in orbit next year, I've been training for my third space flight. This one is almost in a category completely different than the previous two, specifically to live in on the space station for six months, to command a space ship and to fly a new rocket ship.

Don`t let life randomly kick you into the adult you don`t want to become

Decide in your heart of hearts what really excites and challenges you, and start moving your life in that direction

I guarantee if you walk into 100 spider webs, you will have changed your fundamental human behavior. And you can apply this to anything, And figure out a way to reprogram yourself, to change your primal fear.

By looking at the difference between perceived danger and actual danger, you can fundamentally change your reaction.