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Clay Dillow via PopSci.com

BAE System’s Mk 38 chain gun was already a formidable opponent: a 250millimeter cannon capable of putting 180 rounds per minute into the air from the deck of a naval ship, urging those without clearance to keep safe distance (of about 2,000 yards).

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Clay Dillow via PopSci.com

Well kids, it’s finally over. This morning the space shuttle Atlantis came to a wheels stop at Kennedy Space Center, ending NASA’s Space Shuttle era and effectively capping America’s Human Spaceflight program--at least for the time being.

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Joshua Saul via PopSci.com

"Barnacle" has become a term for something tenacious and problematic for a reason--they are determined little buggers that cause lots of damage to marine craft. But dealing with barnacles can create even more problems than it solves.

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