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Always remember reading a book when I was younger called rules of thumbs, It was probably printed about 40 years ago but it was always a great read, all it was was a book filled with "rules of thumbs" I was wondering if you guys had any decent ones, I've always found they interesting.
E.G
If you don't want a cat to jump into your lap, don't make eye contact with it.
If your heart tires before your legs your gear is too low, if your legs tire before your heart your gear is too high.
The examples are pretty boring I know but there's some really good ones about.