Despite some public opinion that green flashes are a hoax, a number of authoritative figures on the subject have spent quite some time studying the phenomena and have concluded that green flashes do, in fact, exist. Even the National Aeronautics and Space Administration (NASA) backs the existence of green flashes: "The truth is the green flash does exist and its cause is well understood" (see antwrp.gsfc.nasa.gov/apod/ap000507.html). Green flashes are sudden, brief appearances of a bright emerald green color at sunrise or, more commonly, at sunset. Although there are several types of green flashes, the one most comonly observed is called an inferior-mirage flash, which appears for about two seconds before the sun disappears below the horizon. This is best seen a few meters above sea level and is the kind of green flash that you may witness during a Mazatlán sunset. Why the flash occurs is an atmospheric wonder. Sunlight is not a single color, but a combination of all colors: red, orange, yellow, green, blue, indigo and violet (ROYGBIV). Our eyes see all these colors at the same time, so they all blend together. But the atmosphere can seperate the colors by bending the light from the sun, like a prism bends light to create a rainbow of colors. When we see the top of the sun disappear below the horizon, the sun is actually already entirely set, but we're seeing the light rays bent by the atmostphere. The atmosphere bends the blue light the most, which means we should actually see a