PFAS are a large group of human-made chemicals that resist heat, water, and stains — and also resist breaking down. Here’s a clear look at what they are, where they show up in everyday life, why they persist, and what practical steps can lower exposure.

We’ve all been told that mold is dangerous and that any black spot means trouble. The truth is more practical. Mold is a fungus that grows when moisture sticks around. This guide explains what it actually is, the common types you’re likely to see (including the one people call “black mold”), why it shows up, and what the EPA says about cleaning small areas yourself versus calling in help.