I figured out how it works!http://www.algodoo.com/algobox/theme/smilies/laugh.gifWell , the raw hotdogs are covering the cooks hot dogs, when you cook them, killer bars get rid of the raw hotdog covering and the cooked is immortal!
i know how he made it. he created many shapes which are connected with a hinge, different shapes connect with different hinges, yet they all have the same speed. i would've explained better but i couldn't think of how.
umm... the gigant-mass-thingy doesn't work right. when you change anything to G (even if it's far away from everything else) everything on the screen except glued objects immediately disappears.