Anyone that has flown post 9/11 knows that airport security has greatly tightened. However, there are still worries that bad guys might slip some weapons past the security at the airport that could be used to take over an aircraft. The invisible weapons that Sprave is testing on his ballistic gel are not literally invisible; a metal detector just won’t detect them.
Among the weapons are some knives made from things like ceramic and flint along with one of Sprave’s slingshots made
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