There are plenty of items that you are not allowed on planes, and usually for fairly obvious reasons. You cannot, for instance, bring ammunition on board. Nor slingshots, firearms, or harpoon guns . Flammable liquids are also a no no, as well as any item containing its own internal combustion engine. The rest of this article is behind a paywall. Please sign in or subscribe to access the full content.

But a ban that sometimes seems weird to people is that you are not allowed to bring a mercury-filled thermometer onto a commercial aircraft. So what is the danger here? Can thermometers be weaponized? Or does "The Man" just not like you knowing the cabin temperature?

Well, it's probably easier to just show you the problem.

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