this post was submitted on 24 Nov 2025
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Explain Like I'm Five
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The bomb doesn't go off until the box is opened.
Short video one shows how a hand grenade works.
Short video two explains that putting a grenade in jar (a glass box) will stop it from detonating until the glass jar breaks (the box is "opened")
The box, be it a glass jar, or a cardboard box, stops the bomb from going off until the box is opened.
Yeah, but glassware sent through the US Postal System has a tendency to break. And I’ve received both letters and packages from the USPS that were seriously mangled.
Kaczynski was meticulous with the construction of his bombs to make sure they didn’t detonate accidentally. One researcher stated that he had an “obsession with wood”, and the FBI even created a reproduction of one of his bombs for a museum that was housed in a wooden box inside corrugated cardboard to make it look like a more typical cardboard package.