Some time ago (1999) a magnetic material, Dy2Ti2O7, was shown to
be a magnetic analog of water ice, and thus dubbed "spin ice". Recently, theories
and experiments have developed the fascinating perspective of viewing
excitations within the low temperature phase of this spin ice as monopoles. I
will present my group's experimental results on this system at ultralow
temperatures, which freeze out many noise sources, allowing these unusual
phenomena to reveal themselves. Our experiment provides an example of how
ultralow temperature measurement techniques can be customized to study novel
states of materials.