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Statistics |
| Unique Visitors: 0 |
| Total Unique Visitors: 29033 |
| Visitors Out: 595 |
| Total Visitors Out: 2829 |
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| Using minerals |
| 2009-02-04 03:19:00 |
Some of the most important natural resources are minerals. Minerals are natural substances that are reached by mining, or digging in to the earth. Minerals can be divided in to two groups; metals and nonmetals. Most metallic minerals are hard and shiny. To realize how important minerals are, you only have to look around. Think of the things you use each day.What about nonmetallic minerals? The salt you use to flavor your food is a nonmetallic mineral. At one time, salt was even used to make window glass. The cement used to make sidewalks is also a mixture of many nonmetallic minerals.Like most natural resources, minerals are not spread eely around the world. An area of the world may be very rich in some resources and poor or lacking in others. South Africa for example has some of the large...
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| Electronic conductors |
| 2009-01-02 04:29:00 |
When the atoms combine to form a molecule, their atomic orbitals overlap to form molecular orbitals. The number of molecular orbitals formed is equal to the number of atomic obitals overlapped. Half the number of molecular orbitals has a lower energy than the rest. These are known as bonding molecular orbitals and the rest of the molecular orbitals, with a higher energy are called antibonding molecular orbitals. Usually all or a fraction of the bondi...
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| Radiation therapy |
| 2008-11-17 08:55:00 |
Radiation can cause cancer. However, it can be used to treat cancer. In treating cancer, cells are exposed to larger doses of radiation. It is inevitable that normal cells in the vicinity of the treated area are also affected and killed. It is for this reason that cancer patients receiving radiation therapy often suffer side effects such as nausea, vomiting, loss of hair, loss of appetite, depending on the region being treated.To minimize the destruction of normal cells, the cancerous tumor is precisely located and a narrow beam of X-ray or gamma ray beam is used. In order to keep the dose as low as possible at any place, the beam is directed at the tumor or lesion and the source is rotated so that the beam passes through different paths of the body, while converging at the tumor.Radiation...
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| Peer pressure |
| 2008-11-16 09:14:00 |
If you named all the people you know who are your age, you would end up with a very long list. All of your friends and other people in your age group are your peers. They support you and give you confidence as you move from depending on your family to being on your own. Your peers also have expectations of you. They may pressure you to act and think like everyone else in a group. Peer pressure is the influence you feel to go along with the behavior and beliefs of your pee...
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| Types of radiation |
| 2008-11-14 08:35:00 |
Radiation that is of interest in radiation biology can be divided in to three types.1. radiation from radionuclide; both natural and man made2. Electromagnetic radiation; radio, microwave, infrared, light, UV, x-ray and gamma rays etc.3. all sub atomic particles; man made and naturalThese types can be grouped according to their origin as natural and man made.Natural radiation- radiation from naturally occurring radionuclide such as uranium, th...
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| What makes a good friend? |
| 2008-11-13 09:39:00 |
Good friend share a number of special qualities. You and your friend expect these qualities in each other. For example, good friends are loyal and faithful. They will not allow others to say untrue or mean things about you. You also expect them to be reliable, or dependable. You can count on ...
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| Energy from fusion |
| 2008-11-13 08:11:00 |
Thermonuclear fusion has been going on in stars since the creation of the universe some 15 billion years ago. The first such event took place on the earth only in October 1952, when the first fusion (hydrogen) bomb was exploded. The high temperature needed to initiate the reaction was provided by a fission bomb used as a trigger. Scientists have been trying very hard to create thermonuclear fusion in a sustained and a controlled manner as a source of electrical energy.Fusion as an energy source to supp...
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| How is Helium useful to people? |
| 2008-11-12 07:51:00 |
Helium is a natural gas that is lighter than air and does not burn. A gas is a matter that has no definite shape or volume. Helium has an ability to lift things in to the air. Helium is an important natural resource with many uses. A natural resource is a natural material on...
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| Where families can find help |
| 2008-11-11 12:02:00 |
A person who is being abused need outside help right away. The first step in getting help is for the abused person to tell a trusted adult. The abused person may need to be in a safe place. A teacher or school counselor can be a good first person to talk with. Whenever there is immediate danger, the...
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| Dealing with family problems |
| 2008-11-11 11:59:00 |
All families have problems. You have learned about some ways families can deal with changes on their own. However, some problems are far too serious to solve by sharing feelings and helping each other. In these situations, the family should seek outside help. Many types of counseling are available.One of the most serious family problems is abuse, or a pattern of mistreatment of another person. An adult or a child might be a target of abuse. A family with an abu...
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