Other Interesting ‘Found’ Research

Today I found out that they use liquid nitrogen at my husband’s worksite. He’s a machinist and they use the liquid nitrogen to shrink the metal enough to slide it inside a hole and when it heats back up, it expands and is a press fit. I had no idea that it could be available at places like this. I don’t know what I might use that bit of information for in books, but I like it.

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