Environmental Science
The blueness of the sky is mainly due to:

Emission of blue light by the atmosphere
Absorption of blue light by the air
The presence of water vapor
The scattering of sunlight by air molecules

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Environmental Science
The wind-chill factor:

Takes into account humidity and air temperature in expressing the current air temperature
Relates body heat loss with wind to an equivalent temperature with no wind
Indicates the temperature at which water freezes on exposed skin
Determines how low the air temperature will be on any given day
Tells farmers when to protect crops from a freeze

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