.... order to generate "high grade" heat, intense enough to convert water into high-pressure steam which can then be used to turn electric generators there must be another method. The concentrated beams of sunlight are collected in a device called a solar furnace, which acts on the same principles as a large magnifying 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 temperat .....

.... one baby every other year. The koala almost never produces twins. In the female's pouch, there are two nipples. The female koala gives birth after a 20-35 day gestation period. When the joey (baby koala) is born, it is no longer than 2 cm and weighs no more than a 1/2 gram. The joey stays in its mother's pouch for 5-7 months. The term "joey² is used when you are talking about a baby marsupial. The mother gives "pap² to the joey, a liquid from the caecum (which is similar to the human organ, appendix.) This is thought to give the joey the ability to eat only eucalyptus leaves. When the joey emerges from the pouch, it clings to its mother for .....

.... so. "Darwin had a youth unmarked by the slightest trace of genius." (Rachels,7). This didn't stop Darwin, though. He never lost this curiosity throughout the years. At the age of 18, he made a very important discovery about flustra, which is "1. That the ova of the Flustra possess organs of motion and 2. That the small black globular body hithero mistaken for the young Fucus lorious is in reality the ovum of the Pontobdella Muricata." (Rachels,7). In the early 1800's, a group of naturalists led by Captain FitzRoy, were planning an overseas trip, which they called the Voyage of the Beagle. They invited Darwin along, not as a naturalist, but as a he .....

.... themselves. It is their addiction speaking for them. It is that little addicted voice inside their minds rationalizing the addiction, because they know, it might hurt to quit. They know that there will be a sense of loss. They know that smoking is as much a part of their personality as being a happy person, or being a morning person, or liking to go to the movies. Smoking becomes a part of who and what you are, An addict. It amazes me the number of people who smoke cigarettes who would never smoke a "marijuana" cigarette. They say "Oh no, that’s drugs" or "I’m not a dope fiend". Sorry pal tobacco is a drug and if you're a smoker, you are a .....

.... has melted. You also should watch the weather. You should not spreed when it is going to rain so the manure won't runoff the field. There are two ways of handling manure. The first is to spread it every or every other day. That is the worst because when you put it on snow and the snow melts it runs into a river or goes down to the ground water and pollutes it. The best way of handling of manure is to build a six month pit or harvester. That means that you can hold your livestock manure and all the runoff that is run into it for six months or more. To build a pit you must have a overview map that shows; "1. Farm buildings, yards sur .....

.... some form. During a cycle there are many biological changes. Due to a depressed thermocline there is less photosynthetic activity resulting in a decrease in the primary life forms that form the beginning of the food chain. The warmer waters that are brought by these changing cycles hold less dissolved oxygen forcing fish to go deeper or venture elsewhere. Due to a lack of data during occurrences it is not fully known if fish populations are depleted solely due to exposure to . A decrease in their growth and reproductive success has been observed by many surveys in coastal waters. The link between climatic effects around the world and is no .....

.... (Doherty 129). Meteors, planets, rockets, stars, artificial satellites, and weather balloons are often the explanations behind UFOs (Doherty 17). The theory, however, that UFOs come from outer space is called the extraterrestrial hypothesis. The only problem with this theory is the distance involved in interstellar travel. Another hypothesis on the nature of UFOs is the demonic force hypothesis. It states that the UFOs represent demons coming to earth for the final battle between good and evil (Randle 112). The not so widely accepted theory is that of hallucination/dream. Its major debunker is that mass hallucinations would have to be fairly common. .....

.... but the hind limbs were lost. The broad horizontal tail flukes that provide the main propulsive thrust bear no anatomical connection to the lost hind limbs, but are a seperate and distint development. They contain no bone, and owe their firm and yet flexible shape to underlying fibrous elastic tissue. The body is enveloped in a thick layer of blubber that aids in bouyancy, helps to preserve body heat, and is a source of stored energy. A cetacean’s skin is free of sweat glands, oil glands, or hair, and feels much like smooth, wet rubber to the touch. Cetaceans, like other mammals, have lungs. They breathe air through a single nostril, or p .....

.... is currently negotiating with an American company to develop prenatal diagnostic tests, which, because the current tests are time consuming and technically difficult to do, are restricted to women over 35 and those who have a family history of chromosomal abnormalities. Prenatal tests using Willard's probes would be much simpler and faster to perform and could be available to all pregnant women who wish to take advantage of the technology. Current prenatal testing involves growing fetal cells in vitro and examining them, over one or two months, to see if there are two copies of a particular chromosome, which is normal, or one or three, which is a .....

.... volume of the world's water, and covers more than seventy percent of the earth's surface (Groliers). Sea water doesn't just contain hydrogen, oxygen, sodium, and chlorine; it also contains every naturally occurring element. Although seawater has a fairly constant ratio of major elements, salinity and seawater can fluctuate. Normally, the salinity is thirty-four to thirty-seven parts per thousand (ppt.), but on a particularly rainy morning, the salinity may decrease to something as low as thirty-two ppt. (Stuller 29). The mixing of freshwater and sea water forms a third type of water, known as brackish water. Brackish water can be found in a v .....