What's the Temperature?

Today, my students used thermometers to measure the temperature of cold icy water and hot water.  You would have thought I had given them a million dollars and the run of the world's largest toy store because all I heard was "Can we do this tomorrow?" and "Can we do this everyday?"  It was so simple, but it was so fun!  They love experiments and hand on activities.  So maybe I should try some more advanced activities...hmmm.