Space tourism will surely be a blast, but can it also improve life on Earth?

My body is suspended midair, and it's all I can do to breathe steadily. Everything around me is whitewashed. The padded ceiling and floor have blurred. I'm not consciously twitching a muscle, yet I'm moving. And I'm laughing — uncontrollably — because my mind cannot accept the absurdity of what my body knows to be true: I'm flying.I am onboard a Boeing 727 owned by the Zero Gravity Corp. It's the only commercial plane that has been approved by the Federal Aviation Administration to t