It's a hot summer day and the sun is bright—perfect weather for taking a dip in your pool. You venture out to the backyard to check out the pool you haven't used since last summer. Lo and behold, it's ...

We may receive a commission on purchases made from links. Ivy growing up the side of a home is charming. Green algae growing on the house? Not so much. Algae looks like a plant, it photosynthesizes ...