this is my version of the bouncing atoms morph found on the world menu of scratch directions: move your mouse to the top corner to change the atom count (which is two by default) and press space to see the infection take place. how to see the real one: right click the loop of the "R" in scratch and click "turn off fill screen" then in the white space outside of it click anywhere and go to "new morph" in the menu that pops up, then select "bouncing atoms" and viola. to have more fun, alt+click the morph and then click the little red list icon floating above it, go to start infection or show infection history or something. as the same, alt+click then clicking the little "x" is to kill when your done. MAKE SURE WHEN YOLU CLOSE SCRATCH SAY "DO NOT SAVE CHANGES" TO THE LITTLE MENU IF YOU DO IT WILL RUIN SCRATCH.
