I first saw this on CNN last Saturday while waiting at the car dealership while the TARDIS was undergoing its yearly inspection: A company called MJ Safety Solutions is hawking bulletproof backpacks for kids and travelers to protect them in the event that someone draws a firearm and starts shooting at people. The backpacks weigh about 1.25 pounds and are meant to either stop the wearer from being shot in the back, or they can be used to provide a measure of protection to the head and torso if the backpack is removed and used as a shield. A …