what are the benefits of having an international space station?
['Commercializing low-Earth orbit. ... ', 'Supporting water purification efforts worldwide. ... ', 'Growing high-quality protein crystals. ... ', 'Bringing space station ultrasound to the ends of the Earth. ... ', 'Improving eye surgery with space hardware. ... ', 'Making inoperable tumors operable with a robotic arm. ... ', 'Preventing bone loss through diet and exercise.']