Hitting the Books: The invisible threat that every ISS astronaut fears

Despite starry-eyed promises by the likes of SpaceX and Blue Origin, only a handful of humans will actually experience existence outside of Earth’s atmosphere within our lifetime. The rest of us are stuck learning about life in space second hand but...

source https://www.engadget.com/hitting-the-books-how-to-astronaut-terry-virts-workman-153021872.html