I am on my way to a few days of skiing in Utah, but I thought I would leave you with this travel story. A few weeks ago I was traveling and was at the airport really early. I had forgotten to remove the toothpaste from my stuff, and I was flagged for extra screening because they saw it on X-ray (I remember the good old days when they were X-raying for guns and stuff rather than toothpaste, but I digress).
The screener pulled it out and said - sorry, this is more than three ounces. So, as an engineer with no sense of self-preservation, I asked, "Weight or volume?" The screener asked what I meant. I said that an "ounce" is a unit of both weight and volume, which did he mean? (The TSA site is no help, it just says ounces). He said "volume." Still being stupid, I said "but the 3.5oz on that toothpaste is weight -- you can tell by the 'net Wt.' in front of it and the number in grams behind it. He looked at it for a minute, and then gives me an answer right out of Spinal Tap: "But its over 3 ounces" [but this one goes to 11]. Anyway, I gave up and surrendered my Crest to government authorities, and the world was that much safer.
I am told by an airline exec that the policy was originally volume, but after many complaints, the government realized that an ounce was also a unit of weight and they have informally changed the policy to "3 ounces weight or volume" but they never really communicated this change fully because it's too, you know, embarrassing that they operated so long not knowing the difference.
Have a good week -- I will probably post a bit but it will be light.