  We show that an alkali atom with a tripod electronic structure can yield rich
electromagnetically induced transparency phenomena even at room temperature. In
particular we introduce double-double electromagnetically induced transparency
wherein signal and probe fields each have two transparency windows. Their group
velocities can be matched in either the first or second pair of transparency
windows. Moreover signal and probe fields can each experience coherent gain in
the second transparency windows. We explain using a
semi-classical-dressed-picture to connect the tripod electronic structure to a
double-\Lambda\ scheme.
