He was selected to be a member of the second class of astronauts in 1962. (scientificamerican.com)
There is also the development of housing being built for astronauts on longer missions out in the depths of space. (relevantmagazine.com)
If you remove the mechanical loading element, the bones think they do nt need to be there and actually get thinner, like what happens with astronauts in space. (health.com)