I was just reading the IMDb FAQs hoping that's where I read the laser gun question (it wasn't), and they say it's a matter of losing bone density. Which doesn't answer all your other very well-thought-out questions. Think of all the sci-fi shows where gravity is simulated and never questioned! You should become a continuity editor.

Yes, but we're also in Colorado, where we have all this beautiful outdoors to be active in. Except, apparently, in Aurora.

Now if you'll excuse me, I have a fiction scene about gasping I wanted to get hammered out today for someone.