Tuesday, September 30, 2008

Fruits and Vegetables Can Protect Your Health

Fruits and vegetables contain essential vitamins, minerals, and fiber that may help protect you from chronic diseases. Compared with people who consume a diet with only small amounts of fruits and vegetables, those who eat more generous amounts as part of a healthful diet are likely to have reduced risk of chronic diseases, including stroke and perhaps other cardiovascular diseases, and certain cancers.

Friday, September 26, 2008

The Goldfish

The common goldfish is remarkably hardy, and it is the most commonly kept pet animal in the world. It ahs been kept as an ornamental fish for centuries, and graced the garden pools & aquariums of kings and emperors for a thousand years.

The goldfish is renowned for its spectacular red-gold colour, can grow to about 20cm in length, and live upto 10 years or more.

The body is protected by rows of overlapping scales that never increase in number, but increase in size as the fish grows. The circuli, or rings of growth, are well-spaced in summer when growth is rapid, but are laid down close together in winter and at other times of poor growth. The tightly-bunched circuli of winter tend to show up as distinct bands, or annuli, and it is these that indicate the years of a fish's life to a trained scale reader.

Tuesday, September 16, 2008

Chestnut

Chestnut trees are cultivated for their nuts or as ornamentals. Probably the most notable species was the large and graceful ornamental American chestnut (C. dentata (Marsh.) Borkh.) (fig. 73), which extended from Maine southwest to Arkansas (Munns 1938). It has been almost completely destroyed by blight. The Japanese chestnut (C. crenata Sieb. and Zucc.) and the Chinese chestnut (C. mollisima Blume) are both cultivated for their nuts.

Chestnut is a deciduous tree or shrub, which is cultivated in a similar manner to other deciduous nut trees. It bears brown nuts, about an inch in diameter, which are usually consumed after they are roasted. From one to nine nuts are produced in a spiny involucre or burr.

Wednesday, September 10, 2008

What causes tornadoes?

Thunderstorms develop in warm, moist air in advance of eastward-moving cold fronts. These thunderstorms often produce large hail, strong winds, and tornadoes. Tornadoes in the winter and early spring are often associated with strong, frontal systems that form in the Central States and move east. Occasionally, large outbreaks of tornadoes occur with this type of weather pattern. Several states may be affected by numerous severe thunderstorms and tornadoes.
During the spring in the Central Plains, thunderstorms frequently develop along a "dryline," which separates very warm, moist air to the east from hot, dry air to the west. Tornado-producing thunderstorms may form as the dryline moves east during the afternoon hours.

Along the front range of the Rocky Mountains, in the Texas panhandle, and in the southern High Plains, thunderstorms frequently form as air near the ground flows "upslope" toward higher terrain. If other favorable conditions exist, these thunderstorms can produce tornadoes.

Tornadoes occasionally accompany tropical storms and hurricanes that move over land. Tornadoes are most common to the right and ahead of the path of the storm center as it comes onshore.

Wednesday, September 03, 2008

solar energy technologies program

The Solar Energy Technologies program focuses on developing cost-effective solar-energy technologies that have the greatest potential to benefit our nation and the world. Solar technologies diversify our energy supply, reduce our dependence on imported fuels, improve air quality, and offset greenhouse gas emissions. A growing solar industry also stimulates our economy by creating jobs in solar manufacturing and installation.