SCIENCE
'(<a href="http://www.j-archive.com/media/2011-06-07_DJ_04.jpg" target="_blank">Jimmy of the Clue Crew displays a chemical formula on the monitor.</a>)  When acetic acid in vinegar reacts with CaCO<sub>3</sub>, this compound in the eggshell, bubbles of CO<sub>2</sub> form in the vinegar & dissolve the shell, leaving just the membrane'
calcium carbonate