Drains are hidden heroes in your home. If you’re lucky, you can go for years without thinking about them, but when dirty sink water suddenly won’t go away or a toilet won’t flush, they can be a major frustration. A plugged drain certainly demands attention, but fixing it is probably something you can do yourself. You’ll get faster results than calling a pro, and you’ll save money, too.

Successfully unclogging drains depends on a few simple tools and knowledge of the layout of pipes hidden in your home.

Modern chemicals do many good things for us. But some also do harm — to us, wildlife or the environment. With U.S. industries now using some 75,000 chemicals, and as we discover more about their downsides, public demand for greater precaution is growing. The dramatic increase in organic food sales in the last two decades is one sign of this growing public concern.

In 2002, the Environmental Working Group, a nonprofit watchdog, released the results of a “body burden” study that found 167 chemicals present in the blood and urine of nine volunteers. Then in 2005, the group reported the results of its tests of 10 newborn babies, in whom it found 287 chemicals present.