how do you figure out something's center of gravity and how do you determine if something is going to topple over? i know there's very important math behind it all but though i was good in high school math that was a LONG time ago now. see i use those hagen chinchilla cages wired together on top of one another to make a larger cage. currently i have 3 cages wired together and am looking into adding a fourth. i'll need a step stool to reach the door of the fourth cage if i am able to attach it but now that i've got a fourth one i REALLY want to attach it. i figure i need a step ladder anyway so i'll invest in that but i don't want the cage falling over with the rats playing in it or if it gets bumped. which is why i need to figure out the center of gravity and all that. so, does anyone know what formula i need to use to figure that out?