Highlights. 1  Acute myocardial infarction is the medical name for a heart attack. 2  A number of different factors may increase your risk for a heart attack, including high blood pressure, high cholesterol, and diabetes.  Call 911 immediately if you believe you or someone you know may have had a heart attack.
The blue color of the sky is due to Rayleigh scattering. As light moves through the atmosphere, most of the longer wavelengths pass straight through. Little of the red, orange and yellow light is affected by the air. However, much of the shorter wavelength light is absorbed by the gas molecules.
Colors of the rainbow in order comprise 7 colors: red, orange, yellow, green, blue, indigo and violet. Each of these colors have their respective meanings. Let's learn more about them... In Meteorology Today, author Donald Ahrens describes a rainbow as one of the most spectacular light shows observed on earth.