"Hoarfrost" and Non-Nuclear Explosions

I learned a new word. "Hoarfrost." Which looks like this:
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I always learn new words when I reconnect with a friend who's very into description and accuracy in talking about lots of things. That's because he's a radio reporter. Some time back we wrote about one of his stories on salmon, which those of you on the East Coast may not know are pretty endangered here. I wrote about salmon like once a week or something for two years for a Seattle paper, so I can tell you a LOT about it if you have 46 hours of free time. Anyway, another of J's stories hits the airwaves this Saturday. Here's the scoop: J: KUOW informs me they'll play my "Ripple Rock Meets its Doom" story again this Saturday afternoon during Weekend America. Sometime between noon and 2pm on 94.9fm. (Or anytime at PRX.org.) D: What is the story about? J: a VERY FUN 4.5-minute story on one of the world's largest non-nuclear explosions, and the Canadians who breathlessly described it on live TV from a bunker on Vancouver Island, 50 years ago this Saturday. D: Cool. I'll stay tuned.