CHEMISTRY
'The chemical symbol for sulfuric acid, it completes <a href="http://www.j-archive.com/media/1984-09-21_DJ_19.mp3">this</a> poem:<br /><br /><i>"Say farewell to the professor<br />He'll be with us no more<br />For what he thought was H<sub>2</sub>O<br />Was..."</i>'
H2SO4