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The engineering mountain managers went to the summit of Mauna Kea two to three days per week, whereas the technicians went there four days per week. It was apparent to me that the technicians were sicker than the engineers.
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Snow cleaning of the world's largest telescope mirrors was an impressive sight. The optics technicians would climb into a huge telescopic boom lift and spray immense clouds of cold carbon dioxide snow and gas onto the ten meter diameter mirrors high above the floor indoors. It would cause some of the accumulated dirt to magically fall off, leaving it less dirty.
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