Heck - glass is a liquid. Maybe not by TSA standards, but it's still a liquid.
However, I'd be surprised if you couldn't take a PB&J sandwich past airport security. It's supposed to be about the liquid explosive scare and a sandwich isn't going to for a very good explosive.
When my daughter was living in London and craving Jif, I packed a huge jar of it in my carry-on bag never imagining it would be considered a liquid. They confiscated it from my bag, and I am sure some TSA agent took it home and had himself a big old PB&J sandwich.
It's a great backpacking food. I jammed several single serving Jif cups into a bear canister (bears love PB too). It's calorie dense. I had it for breakfast.
However, park rangers weren't exactly going to confiscate it when lining up to climb Half Dome.
I know you're just being a bit snarky, but that's an Urban Legend... Old "wavy" glass is that way because of older plate glass manufacturing techniques. If you think about it, old glass vases (even ancient Egyptian ones thousands of years old) don't "sag" with age. Glass is a classified as an "amorphous solid" that does not "run" or deform to any detectible degree due to liquid flow anywhere near ambient temperatures:
...cathedral glass should not flow because it is hundreds of degrees below its glass-transition temperature, Ediger adds. A mathematical model shows it would take longer than the universe has existed for room temperature cathedral glass to rearrange itself to appear melted.
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