Tags life support textbook science fiction life support topics and issues growing food in space space food supply O2 concerns C02 ISS as a model children in space ISS Animal Enclosure Model (AEM) bone loss issues reduced gravity birth in space space settlement risk factors bone fracture risk artificial gravity spinning tethers ISS centrifuge project SpaceX and artificial gravity Starship life support scrubbing CO2 from spaceship environment submarine model low risk for fractures Skylab facts Dr. Seedhouse and science fiction Vasimir Update Guest Dr. Erik Seedhouse Tagline Erik returns to share his latest books and news with us View the discussion thread.