What evidence shows that gravity is a major cause of thinning discs?
– Astronauts grow in space! After 84 days in space (a gravity-free environment) astronauts grew 2″ in height. During twelve weeks in orbit, their discs had continued to take moisture from the blood stream, but with no gravitational pull to squeeze moisture out, the discs remained plump, making their spines longer, and themselves taller. In fact, space suits are designed to accommodate the extra 2″ spinal stretch. After a few days on earth (a gravity environment), they returned to their normal height.
