While learning about bones recently, we did a demonstration of "hallow" bones (billed with marrow) and how their design is better than if we had solid bones....
The demonstration was shown by loosely rolling a piece of paper, taping it, and then seeing how many books you could stack. As the photo shows, quite a few
Next we were to take a piece of paper and roll it tightly to demonstrate the lack of strength that bones would have due to a solid design.
The point was lost on my children who quickly pointed out that the books wouldn't stay put, not because of the "bones" solid interior, but because of the lack of surface area for the books to rest on. Well played boys.
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