Scans on astonauts reveal serious damage to eyes and brains

Well, darn. We're just going to have to figure out antigravity.

But for the next few hundred years, maybe we should use those rotating space stations and spacecraft that I remember seeing in books when I was a kid.

http://www.dvandom.com/coriolis/spacestation.html

Is this caused by zero-g or by the low pressure (0.3 bar) environment of the ISS/Shuttle?