Learn how to crochet a folklore granny square in this beginner-friendly tutorial. Step-by-step instructions make it easy to ...

Millions of fire hydrants in drinking water systems are rarely used, creating stagnant zones. A new study reveals these zones are breeding grounds for opportunistic pathogens and are governed by ...

This article is also available as a pdf version. A young man walks toward the entrance to an underground subway. As he starts down the escalator, his heart rate increases, but he continues. He ...