The temperature on any given summer day may be in the 80s or 90s. So why does it feel so much hotter and oppressive at times? That's the heat index doing its thing. Here's how it works: What is the ...

Industry leaders realized hundreds of years ago that their processes and machines operate best when the indoor relative humidity is maintained at an optimum level for their process. They found it was ...

Noel Kirkpatrick is an editor and writer based in Tacoma, Washington. He covers many topics, including animals, science, and the environment. Complaining about the humidity is a go-to conversation ...