The Danger Is Different From

Other Anatomical Changes Associated With Long-duration Space Flight Are Definitely Negative: The Immune System Weakens, The Heart Shrinks Because It Doesn't Have To Strain Against Gravity, Eyesight Tends To Degrade, Sometimes Markedly (no One's Exactly Sure Why Yet). The Spine Lengthens As The Little Sacs Of Fluid Between The Vertebrae Expand, And Bone Mass Decreases As The Body Sheds Calcium. Without Gravity, We Don't Need Muscle And Bone Mass To Support Our Own Weight, Which Is What Makes Life In Space So Much Fun But Also So Inherently Bad For The Human Body, Long-term.

There Is No Problem So Bad That You Cannot Make It Worse

I've Had A Chance To Fly A Lot Of Different Airplanes, But It Was Nothing Like The Shuttle Ride.

It Is Spectacular. From About Five Minutes In, When We Knew For Sure That We Were Going To Have The Weather To Go, The Smile On My Face Just Got Bigger And Bigger, And I Was Just Beaming Through The Whole Launch. I Mean, It Is Just An Amazing Ride.

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.