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lb is the abbreviation for pound, a unit of mass. If you want to convert that to kilograms, you can multiply by 0.453 (assuming you mean U.S. pounds).
Six and one quarter pounds = 100 ounces
It is 2.83 kilograms.
The femur is the strongest and thickest bone in the body. It can take about 600 LBS of vertical force before it breaks. That pretty much means that if you set it up so it was horizontal, with a space in between the things holding it up, and put 600 pounds on it, it would snap. That's strong.