After cooking a whole chicken, I had a wishbone to show Bear.  I told her about how you can wish on this bone when you break it.  Since we then had two pieces, I put one in vinegar and left one out in the air.  I told Bear she’d feel something really neat in a two or three days.

 The bone left in the air was hard and stiff.
 The bone in the vinegar was all rubbery.
The vinegar is a mild acid and dissolves the calcium in the bone.  Calcium is what make the bones hard. 
Here’s a link to a detailed how to for those who like directions.
Written by Julie Cerdas
I'm a stay-at-home Catholic mom who loves playing with and teaching my two children.