Instruments on the Cassini spacecraft have been hearing noises that sound like lightning on a short wave radio, but the Cassini cameras have been blinded by ring shine, which makes the night side of Saturn brighter than Earth under a full moon. We finally saw the lightning during Saturn’s spring equinox, when the rings were edge-on to the Sun. Now Earth, Jupiter, and Saturn are the only planets that unequivocally show lightning. Presumably lightning is an indicator of falling ice and liquid water.  The talk will focus on what we have learned and hope to learn about the giant planets from studying lightning in their atmospheres.