tag:techtv.mit.edu,:Array/185244480 2008-01-17 14:39:44 -0500 professorblue <span>Do you know where your drinking water comes from? We will check it out in Professor Blue’s classroom.</span> 264 tag:techtv.mit.edu,:Array/185205640 2008-01-22 17:00:24 -0500 professorblue In this pod, Professor Blue swims in her laboratory to talk about water. We do not know how she managed to get the submarine in that lake, though! 230