Even a small animal centrifuge would have been very useful.
Sawyer is right. Gravity research is one of the critical things we need to do before we can effectively colonize the solar system. What level of gravity is enough to prevent the long-term effects of zero-G? Half a gee? Mars level? Moon? None of these?
Are there medical methods to replace the stimulus on the body that creates bone strength and other things? Can a person be adapted permanently to zero-G? Reproduce safely? Could such a person ever return to normal gravity? After a few generations living in an asteroid colony, would the inhabitants even care?