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Oh and a funny story of the knowledge you can miss being someone who lived in Hawaii for 20 years followed by 8 years in California.
A few weeks ago we had a freeze and Lani was driving me to the BART station. There were little blooms of frost on the windshield and as we're pulling out of our parking lot she turns on the windshield wipers. No effect. So, faster than I can shout "NOOOOO!!!!!!" she gives it a spray of wiper fluid.
Instant opaque sheet of ice covering the entire windshield
and we're stopped in the middle of the street with me doing my best to scrape the ice off with a t-shirt that happened to be in the back seat.
Minor chemistry lesson: massively and suddenly increasing the surface area of a liquid at or below freezing will allow it to freeze really quickly.
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