You may remember the R & B group Earth, Wind, and Fire. The name contains two of the classic Greek primary elements, but leaves out the third, water. In fact in googling pop music groups over the past 60 years, I can’t find any containing the word water. Yet, the more we know the more we learn — and most often after the fact — how important water is to the Earth and life. Some of the 10 to 20 million species recorded thus far in the world can survive without air; none can survive without water.