This is such a fun STEM idea…use a colander and rubber band to make a trampoline! Then test it by dropping a ball on it. Would be so easy to do at home or in the classroom. Great blog post from "STEM Activities for Kids"
how to put a Ball Jointed Doll together 1.dowel pins epoxied into each joint of your BJD. 2. Line each joint with leather (soft side glued to the porcelain, shiny side of leather out, very important) 3. Assemble your springs, swivels, and s-hooks.The picture below is a sample of how one portion of the Ball Jointed Doll (BJD) assembly is constructed; each section will be different: