source https://www.engadget.com/hitting-the-books-how-to-astronaut-terry-virts-workman-153021872.html
26 Eylül 2020 Cumartesi
Hitting the Books: The invisible threat that every ISS astronaut fears
source https://www.engadget.com/hitting-the-books-how-to-astronaut-terry-virts-workman-153021872.html
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