Where Does Dust Come From?

Dust

Housekeepers spend a good deal of time dusting.  Dust settles from the air and makes a gray coating over everything around us.  

Dust is more that just specks of dirt.  In the ordinary dust you could collect from a windowsill, you would find tiny chips of rock, bits of dead wood and dried leaves.  

Dust may also have in it spores from plants, pollen from the powder in flowers, spot from smoke, cinders left from meteors burning up on their way to earth, and other bits of matter that float in the air.  Dust may drift hundreds of miles before finally setting because of gravity.-Dick Rogers

How are diamonds cut into pieces?

Diamond

To bring out the brilliance in a diamond, many little sides, or facets, must be cut and polished on it with other diamonds.  Most diamonds look like dull pieces of glass when they are taking from the ground.  Before they are used as jewels, diamonds are cut and polished.

The cutting and the polishing has a great deal to do with how a diamond sparkles.  To bring out its full beauty, many little sides, or facets, must be cut and polished on the diamond.  Diamonds are found in many sizes and shapes.  Usually two or more gems are cut from a single stone.  People, called diamond cutters, can break a diamond in two with just one tap from a hammer.  Sometimes a diamond cutter uses a saw with an edge  made of diamond dust to saw a diamond in a half.

Next, he grinds off that diamond’s corners so that it is in shaped like a top.  The little faces, or facets, are then ground on the diamond by pressing it against a revolving iron dist coated with a past made from diamond dust and oil.  Upon entering a finished diamond facet, a light ray is refracted, or bent, and reflected back in a glittering rainbow of colors.  The fiery brilliance of the diamond has made it the world’s favorite jewel. – Dick Rogers

Poison in the air (1)

Good morning everybody. We all know that clean air is very important in our body. It gives us healthy body when we inhale a clean air. By the information given by Atty. Romeo Pefianco, there are particles in the air that causes respiratory ailments. We should be all aware of that specially to all children.

According to the World Health Organization (WHO) the worst air pollution is undoubtedly in Asia. More than 1.5 million Asians die each year for the effects of air pollution alone, and another half million die from water pollution.

High levels in China and India

Anything over 100 micrograms of particles per cubic meter of air is considered dangerous. But in cities like Taiyuan, China and Delhi, India the levels routinely top 500 micrograms.

The danger is compounded by the fact that so many people in these areas cook indoors with coal briquettes. Particles in the air are a major cause of respiratory ailments in Asia; such ailments are a leading cause of death in China.

Not local but widespread

Although we tend to think of air pollution as a local problem, studies reported in 1995 demonstrate that there are widespread effects. It is reported that air pollution is so pervasive in industrial regions of northeastern North America, Central Europe and eastern Asia that it partly blocks sunlight, counteracting global warming with regional cooling.

Deadly pollutants

The basic law dealing with air pollution is the Clean air Act of 1990, which orders the US Environmental Protection Agency (EPA) to set standards for air quality. EPA monitors air quality at about 3,000 sites for six air pollutants: (1) particular matter — soot and dust (2) sulfur dioxide (3) carbon monoxide (mostly from automobiles (4) nitrogen oxides (5)lead and 6) ozone.

Particulate matter (PM) is measured with an aerodynamic diameter smaller than 10 micrometers down to 2.5 micrometers. This includes dust, dirt, soot, smoke and liquid droplets directly emitted into the air from factories, power plant, cars, construction sites, fires, and natural erosion, as well as particles formed in the atmosphere by condensation or transformation of emitted gases such as sulfur dioxide and volatile organic compounds.

PM is responsible for most health problems like COPD, influenza, asthma and adverse effects in the lower regions of the respiratory tract.