Okay, as much as I love Rocky extending Grace's life without telling him, consider: Rocky *does* tell Grace, Grace just then somehow manages to like. Horrendously misinterpret what the treatment is actually for. Like.
Eridian Doctor: We went through the human genome and found a bunch of places with old broken DNA repair mechanisms so we came up with a gene editing therapy that fixes them in order to extend your lifespan.
Grace: *flashbacks to when Rocky found out that humans can experience long term effects from lower doses of radiation exposure and Grace wasn't being as careful as he should have been back when they first met because he still thought this was gonna be a suicide mission*
Grace (internally): Oh, so cancer prevention! Got it!
Grace: Sounds good!
*like 100 years later*
Grace: Hey Rocky, how am I not dead yet?
Rocky: ???
Eridian doctor: this treatment will increase your bone density to prevent them breaking
Grace internally: Oh right, low gravity can cause bone degradation. Makes sense that after so long in space it'd be good
Grace: sounds good to me!
One modification to the LPR5 gene later
Grace falls off a cliff
Grace: Hey why didn't I break any bones???
Rocky: ??? We made your bones strong statement
They add more salt or something to the water in his enclosure so that he can still swim comfortably despite the increased density.
