Hardened steel is very durable, but nearly impossible to work with at home. If you are trying to choose a piece of steel and can't tell if it's hardened or not, you're in luck, because this video contains a quick method for doing so. All you do is try to file an indentation in the steel with a file. If that doesn't make a mark, you've probably got hardened steel.
Just updated your iPhone? You'll find new Apple Intelligence capabilities, sudoku puzzles, Camera Control enhancements, volume control limits, layered Voice Memo recordings, and other useful features. Find out what's new and changed on your iPhone with the iOS 18.2 update.
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