.... more than one episode. These episodes can last from weeks to months. They occur whenever and have no certain pattern. Sometimes a stressful life event can trigger an episode, and sometimes they just happen. If a person has more than four episodes a year they are known as “rapid cyclers”. This is more common in women. There is no exact reason for what causes manic depression, but some doctors say that it may be from imbalances of certain kinds of brain chemicals. Heredity also has a little part to do with it. Manic depression is treatable though. Medication, such as lithium can be given. Counseling can also help the pers .....

.... glass. The solar furnace takes the sunlight from a large area and by the use of lenses and mirrors can focus the light into a very small area. Very elaborate solar furnaces have machines that angle the mirrors and lenses to the sun all day. This system can provide sizeable amounts of electricity and create extremely high temperatures of over 6000 degrees Fahrenheit. Solar energy generators are very clean, little waste is emitted from the generators into the environment. The use of coal, oil and gasoline is a constant drain, economically and environmentally. Will solar energy be the wave of the future? Could the worlds req .....

.... am writing down what everyone recorded for me. I am first: JOSH: I could see black blood vessels with orange in the background...it looked like a lot of dead tree. BRENDA: The blood vessels resembled jagged lighting bolts or trees in the winter time. LAURA: I saw crooked lines that didn't stand still, but kept changing. DARWIN: The image appeared to be in front of the body and quite enlarged. I found that it takes practice to see this. BRYAN: Sometimes your eye gets tired before you can successfully do this, so you may have to use the other eye or take a rest and try it again. MATT: I saw black lines that branched ou .....

.... to move past sixty degrees fahrenheit. The spring spawning urge in a bass is set off by both water temperature and photoperiod. Photoperiod is the proportion of the day in which the bass are exposed to sunlight. As the day light hours grow longer through the spring and early summer, so does the photoperiod. This process affects the temperature of different bodies of water in different ways. Small shallow ponds heat up much earlier in the year. As a result the bass will begin to spawn much earlier than the bass in large lakes. They will also finish earlier. The spawning of bass usually vary from two to four months. The male .....

.... reduced the natural variability inherent in primitive plant forms and related species of crop plants. Agricultural process, as a result of new breeding programs, has reduced rather than increased crop variability as improved cultivars, or varieties, are planted in wider and wider areas and old cultivars, which may contain valuable genes, are lost. Crop failures, which result in a smaller gene pool, have led to an increased awareness of the need to preserve genetic diversity in plants. Efforts are under way to increase collections of plant materials in various forms. Usually these are preserved as seeds, but living plants, poll .....

.... is so great when it first collides, that a nuclear reaction occurs and the gases within the star start to burn continuously. The Hydrogen gas is usually the first type of gas consumed in a star and then other gas elements such as Carbon, Oxygen, and Helium are consumed. This chain reaction fuels the star for millions or billions of years depending upon the amount of gases there are. The star manages to avoid collapsing at this point because of the equilibrium achieved by itself. The gravitational pull from the core of the star is equal to the gravitational pull of the gases forming a type of orbit, however when thi .....

.... wing. Movement of air about the airplane, particularly the wing, is necessary before the aerodynamic force of lift becomes effective. During flight, however, pressures on the upper and lower surfaces of the wing are not the same. Although several factors contribute to this difference, the shape of the wing is the principal one. The wing is designed to divide the airflow into areas of high pressure below the wing and areas of comparatively lower pressure above the wing. This pressure differential, which is created by movement of air about the wing, is the primary source of lift. The weight of the airplane is not a constant. It var .....

.... population densities centring on the lowland rain forests of the Amazon Basin - dry woodland and grassland also serve as suitable terrain, although the cat is rarely found in areas above 8000 feet. The overall body size and coloration of the cat often relates to its location - found in dense forested areas of the Amazon Basin are often only half the size of those found in more open terrain and it has been suggested that this can be related to the more frequent occurrence of larger prey species found in open terrain . Coloration of dense forest dwelling is often darker than those found in grassland and scrub forest - here, as with .....

.... exercise, climatic conditions, exposure to airborne irritants and emotional upsets as the main trigger factors. However, doctors use a general classification to identify a patients pattern of asthma…classifying people who experience some symptoms of asthma on most days as having a chronic asthma condition. The classification system also extends to the categories of children, occupational asthma and asthma in later life. Usually regular medication is required to keep the lungs functioning as normally as possible. Some chronic asthmatics have severe symptoms over a long period of time and may require long term or indefini .....

.... the dealer can make a larger profit. Since addicts don't know about the purity of a substance, many die because of overdoses. In an overdose of heroin, the lungs stop functioning, and the person dies from lack of air. There can be other effects of heroin addiction, one is that people who have illnesses may have them go untreated because the heroin has masked the pain. Another is that peoples veins collapse, from having been injected into to often. Their skin may also be covered with sores from needles. Dirty needles can often cause serious infections. Another common narcotic is opium. It is made by drying out the gummy, dark b .....