I think it is safe to say that we are not a sci ency family. When Brylee came home from school and announced she had to do a science experiment. I turned to the internet to find and idea.
This is at the science fair--all of the kids seemed kind of bored just sitting there.
Brylee chose to do hers on a bone and can it bend?
Here is the bone---pretty hard to bend.
We soaked it in some apple cider vinegar for 3 days. 
It was amazing the vinegar is an acid and it depletes the calcium out of the bone. So you ask your self gosh all of the times I have eaten vinegar am I depleting my calcium?The answer is NO. We produce something in our intestines that breaks it down. As we age we make less of it and that is why old people break bones easier and so on.
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