Fixed a typo

presentation.html

@@ -76,7 +76,7 @@ <h2>Sucks</h2>
 					<h2>What does the fox say?</h2>
 					</section>
 					<section>
-						If it makes a sound but no one can hear it and no one can claim to have hear it then does it have a sound at all?
+						<p>If it makes a sound but no one can hear it and no one can claim to have heared it then does it have a sound at all?</p>
 					</section>
 				</section>
 				<section data-state="eclipse" data-background="images/solar-eclipse.jpg">