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How do submarines work?

Submarines are some of the most mysterious pieces of military technology. They stay hidden much of the time and details of their capabilities are closely under wraps. But, what do we actually know about them and how exactly do they work?

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New eBook: ‘Cryptocurrency 101’

Don't want to lose your dough to crypto? Check out my new eBook, "Cryptocurrency 101." I walk you through buying, selling, mining and more!

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