Originally published at: http://www.howtogeek.com/trivia/calves-are-fed-what-non-nutritive-substance-to-protect-them-from-later-disease/
Think you know the answer?
I don't think "disease" is the correct term for this problem, hardware or not!
Why not? It fits most definitions I could find.
I'd also like to point out that automatic transmissions work the same way. There is a magnet on the drain cap that catches fragments of metal that could damage the internals.
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