"Sure has been a warm winter," or "It's kind of been a cool spring, don't you think?" is the kind of weather-related smalltalk humans have grown to love. But with these anecdotal statements comes science and the ENSO Web site is just the place to go to better understand the El Nino-Southern Oscillation, or ENSO. As the site states in The Simple Picture section, ENSO "is a system of interactions between the equatorial Pacific Ocean and the atmosphere above it...El Nino is when the equatorial Pacific is warmer than average, and La Nina is when it is cooler than average." This site, part of the International Research Institute for Climate Prediction is located at the Lamont-Doherty campus of Columbia University, provides a lot of great information for the curious climate enthusiast, educators searching for reliable teaching information, or students researching climate-related information.