Cory Doctorow, at boingboing, on the TSA snowglobe ban:
The TSA says you can't carry a snow-globe onto a plane, even if it fits in your freedom baggie, because they can't measure how much liquid it contains, and therefore it must contain more than three oz of potential explosive, um, water.
TSA, meet Archimedes. He lived over 2,000 years ago and figured out how to calculate the volume of a object by measuring its displacement. If you actually believe that 3 oz is a magical high-danger threshold, please consider adding a delightful, hallucinatory element of science to your pseudoscience by putting an Archimedes tank at the checkpoint. It would be a lovely counterpoint to your other scientific tests, such as the ducking stool and the spirit-rattles.