NASA astronaut Loral O’Hara replaced components on the biological printer, BioFabrication Facility (BFF), testing organ-like tissue printing in microgravity. Expedition 70 investigations support crew health for future lunar and Martian missions. Astronauts conducted vein scans, worked on the NanoRacks External Platform, and performed various experiments, including cell sample analysis and Earth science hardware setup aboard the International Space Station.