Poor indoor air quality represents one of the top five public health risks, according to the National Institute of Environmental Health Science. With the average person spending about 90 percent of his time indoors, taking steps to improve the air quality in your home can provide significant health benefits.

The most common type of air conditioning system is the split system, which puts the air handler inside the home and the condenser and compressor outside the home.

Close to 50 million children attended America's public schools in 2010. Five million more students occupied lockers in private schools. Prekindergarten and kindergarten enrollment numbers are breaking records accoring to the United States Department of Education.

Ductless air conditioners are ideal for houses where building new ductwork would be cost-prohibitive. Like regular central air conditioners, ductless air conditioners are split into two main parts, an outdoor condenser and an indoor unit that handles the air circulation.

Ductless split air conditioners offer a wide range of flexibility, as there are many choices for placement. Ductless split systems have both an indoor air-handling unit, as well as an outdoor compressor. The two components are linked through tubing.

Roof-mounted air conditioners offer the best possible cooling capacity. They typically require split-system features, as they cool through ductwork.

Septic tanks are used in locations that lack access to a city-provided sewage system. Several types of septic systems are available, and one alternative to traditional septic tanks is the aerobic septic tank.

Bleach is a traditional cleaner, a favorite in many households, but bleach can leave a lingering smell on your hands. It is economical and effective at removing mold, mild, viruses and stains, so many homes and businesses rely on bleach for cleaning and laundry needs.

Dust mites are small organisms that are related to spiders. They live by consuming dead skin cells and are well-suited for warm and damp environments. Dust mites can cause allergies in some people as a result of a protein found on their body, resulting in irritation and inflammation of the nasal passages and sinuses.

Though you are unlikely to become rich from recycling cardboard, you may be able to earn some additional spending money by turning in your old boxes or scraps. You may also be able to take discarded or unwanted boxes from your place of employment.

Metals of all types are important and valuable resources. Although their natural supply or the supplies of elements that go into producing various alloys are fixed, metals are highly recyclable and reusable. Precious metals, such as gold and silver, are rarely, if ever, discarded.

Illite, most commonly known as French green clay, is a type of mineral clay valued for its highly absorbent properties. Illite is a bio-mineral, composed of both decomposed plant material and trace minerals such as calcium, aluminum, magnesium, silica, phosphorous, copper and zinc.