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NASA Astronaut Ricky Arnold performs microscope photo document operations for the Protein Crystal Growth-13 (PCG13) experiment. The PCG13 investigation seeks to enhance the way crystals are grown in a microgravity environment by allowing crew members to observe imperfections within a crystal and make real-time adjustments to follow-up experiments, rather than returning a sample to Earth and relaunching to try again. This dramatically reduces the time it takes to conduct an experiment aboard the space station and creates a timely, realistic and more cost-effective solution for prospective researchers.