What makes our bones hard?  That's right!  Calcium carbonate -- the same thing that made the egg shells hard.

Optional:  Knotted Bones Printable Activity Sheet

Take some thin Turkey bones and drop them in vinegar for a day.  Take them out and they'll be soft just like the egg shells were.  

Now you can tie them in a knot, just like a piece of string.

Leave them sitting out on the table and they'll get hard again!

Take them to school for sharing time and see if your classmates can figure out how you did it!