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[embed]https://www.youtube.com/watch?v=dCXkaQa53QQ&feature=youtu.be[/embed] Making liquid nitrogen is hard - in fact up until 150 years ago scientists doubted whether it was even possible to... read more
https://youtu.be/MV5PGjWl2Yc How do astronauts survive the deadly radiation of deep space? NASA is still figuring out how to protect astronauts from cosmic radiation -- like plastic shielding and... read more
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