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.
Let us revisit the seven colors of the rainbow and what each one represents: 1  Redâ This is the first color of the rainbow from top. 2  Orangeâ This light or color is a combination of yellow and red. 3  Yellowâ This is the color of the sunshine itself. 4  Greenâ This is the middle color of the rainbow and denotes fertility, growth, balance, health and wealth.