This episode is an introduction to the astrological categories called Elements. It also reviews Qualities, so it is a good overview of astrology. People that are in the same Element tend to have great chemistry together. These are the people that are perfectly compatible with each other. The Elements are Fire, Earth, Air and Water. The web page TheGoodReverendJim.com/astrology101 has a chart on it that is a nice reference to have for this and other episodes.