... between 1869 and 1877 found that 650 miners working in the mines had a life expectancy of 20 years after entering the mines. It was two german doctors, Harting and Hesse, who brought this to the public. The doctors found that 75 percent of the miner deaths were due to lung cancer. But with their scientific knowledge the doctors could only assume that the deaths were caused by the inhalation of arsenic. Later studies between 1900 and 1940 found that the deaths were caused by radiation in the mines. The radiation the miners were exposed to would later be identified as uranium. Uranium is a natural occurring element, it has a atomic count of 92. Uranium is easily ...
... As the goals of the project were made clearer, our group began discussing possible ideas for the design. There were some disagreements about whether we should take the electromechanical route or the purely electrical one. And after some deep thought, we all agreed that the mechanical way would be the simplest to build and the most merciful on our pocketbooks. Even though we were coming up with some good ideas, each design seemed to contain some major problems. One of the reoccurring problems dealt with the synchronization of the driver motor and the steering system. Finally the team came up with a design that allowed the drive and steering controls to be inde ...
... used in acupuncture are usually only inserted from 1/4 to 1 inch deep into the skin. There is usually no pain in acupuncture. Usually if any pain it is only mild. Most of the needles now used in acupuncture are disposable needles. Acupuncture does not always only involve needles. They may also use other methods such as moxibustion, cupping, electronic stimulation, magneotherapy and various types of massage. There are also many different styles of acupuncture practiced all over the world. There are many things to consider when choosing an acupuncturist. Acupuncture is a licensed and regulated healthcare profession in about half the states in t ...
... you might take for granted. For example a simple ordinary broom is a machine. It is a form of a lever. Our country or world would never be this evolved if it wasn't for machine. Almost every thing we do has a machine involved. We use machines to manufacture goods, for transportation, ect. In the W=F*d equation the trade of between force and distance is as you use a machine the force goes down and distance goes up. If there was no friction they would be equal and trade. There are six simple machines. They are a lever, pulleys, inclined plain, wheel and axle, screw, and wedge. The lever is used very often an example of a lever is a broom. Your hand is the fu ...
... done in the field of genetics, in the next section, I will discuss a few. First, genetics came into the public view in the early 1970’s when a scientist named Paul Berg began experimenting with a strain of E.coli bacteria called SV40. (Tagliaferro 69) This was the public beginning to the struggle surrounding genetics. Berg was not very intelligent about the way he conducted his tests, and he was forced to stop, until the National Institute of Health determined that SV40 was harmless to humans. (Tagliaferro 70) The next major happening in genetics was the Asilomar Conference of 1973. The Asilomar conference was a good start, but it did not set strict enough s ...
... something that would change his life forever. Just north of his position flying at an altitude of 9,500 feet and an unprecedented airspeed of 1,700 mph he spotted nine circular aircraft flying in formation. According to his estimate the aircraft were approximately the size of a DC-4 airliner ( Jackson 4). This account was the first sighting to ever receive a great deal of media attention. This sighting gave birth to the phrase "flying Saucer" coined by a reporter named Bill Begrette. Although not the first UFO sighting in history, Kenneth Arnolds account is considered to be the first documented UFO sighting. The following day Mr. Arnold di ...
... dissolve in each other in any proportion; others have limits. If a solute added to a solution above a certain amount will not dissolve, the solution is called saturated. For most substances, solubility increases with increasing temperature of the solvent. In general, molecules that are structurally similar to the molecules of the solvent have the highest solubility. When a solute is added to a solvent, several physical properties of the solvent change. Its boiling point rises and its freezing point lowers with increasing concentrations of solute. Solutions are similar to other types of mixtures known as colloids and suspensions. Colloids are mixtures of tiny ...
... Some cases of red tides do not show any change in the color of the water at all. This makes a red tide very hard to predict or find. Red tides often occur when fresh water runoff creates a stratified surface layer above colder nutrient-rich waters. "heavy rains might have helped the red tides develop by pouring fresh water and nutrients into surrounding sea waters," (New York Times: Sept. 19, 1996) Fast growing algae quickly strip away nutrients in the upper layer, leaving nitrogen and phosphorus only below the interface of the layers, called the pycnocline. Many swim at speeds of 10 meters a day, and some go through vertical migration rising to the top of t ...
... successfully to timely and appropriate intervention." Definition of " develops during the first six months of gestation . Neurons are churned out in the brain's ventricular zone. Attached to fibers, the neurons travel to the cerebral cortex, which contains the language centers. Here they hit a barrier, stop and take their place in layers above previously deposited neurons, (which is normal). In the brains of dyslexics, how-ever, there are breaches in the barrier and the neurons enter them, leaving clumps of nerve cells called ectopias, which appear to interface with the brain's ability to receive and transmit certain messages. They are now finding that ...
... cause the Earth's surface to warm up to a dangerous degree. Since 1850 there has been a mean rise in global temperature of approximately 1° C (approximately 1.8° F). Even a limited rise in average surface temperature might lead to at least partial melting of the polar icecaps and hence a major rise in sea level, along with other severe environmental disturbances. An example of a runaway greenhouse effect is Earth's near-twin planetary neighbor Venus. Because of Venus's thick CO2 atmosphere, the planet's cloud-covered surface is hot enough to melt lead. Water vapor is an important "greenhouse" gas. It is a major reason why humid regions experience less coo ...
