So now you are allowed to carry a knife on board an airplane. Yes, the TSA announced that if your knife’s blade is no longer than 2.36 inches, you will be allowed through security and onto the plane.

You must leave your 10-ounce tube of toothpaste behind. And your 6-ounce bottle of shampoo. And your bottle of water. Because you might be a terrorist. And terrorists can bring down planes with toothpaste. Or with whatever they filled the tube with. (They must be really, really clever if they managed to put anything back into a toothpaste tube.)

There is apparently no Logic Office at the TSA. Clearly a terrorist can do a lot of damage with a blade 2.36 inches long. As much damage as the 9/11 baboons did with the much shorter blades of box cutters. If the TSA fears terrorists, allowing them such blades makes no sense.

Nor do the bans on stuff like toothpaste and shampoo. The TSA worries that a terrorist might carry an explosive in the containers. If those containers holds less than 3.4 ounces, no problem.