"C" IN PHYSICS
'(<a href="http://www.j-archive.com/media/2008-04-28_DJ_18.wmv">Sarah of the Clue Crew puts a thin glass tube in a dish of liquid, and the liquid crawls up inside the tube.</a>)  Appropriately, blood and other liquids tend to rise up a small tube because of a phenomenon called this action'
capillary