... supernova of recent times was detected in the relatively nearby Large MAGELLANIC CLOUD, on Feb. 23, 1987, by an astronomer at Chile's Las Campanas Observatory. It quickly became an object of intense study by all the means available to modern astronomy. A supernova may radiate more energy in a few days than the Sun does in 100 million years, and the energy expended in ejecting material is much greater even than this. In many cases, including the Crab nebula supernova, the stellar remnant left behind after the explosion is a NEUTRON STAR--a star only a few kilometers in diameter having an enormously large densit ...

... Gravitation in 1666 (Eddington 93). As Newton later wrote, it is the story of the sight of an apple falling to the ground (he was resting at Woolsthorpe because of the plague at Cambridge) that caused Newton to wonder if this same force was what held the moon in place (Gamow 41). Newton knew that an object fell to the earth at a rate of about 9.8 meters (32 feet) per second second as pointed out by Galileo. Thus "the apple that fell from the tree" fell to Earth at about this rate. For the first basic explanation of this we will assume a linear plane, one in which all forces act in only one direction. Therefore w ...

... gold foil and expected the particles to simply travel straight through the foil. However, he obtained very different results. Although many of the particles did in fact go straight through the foil, some of them were deflected at large angles. Rutherford concluded that the deflections of the alpha particles were caused by a center of positive charge that contained most of the atom's mass (the nucleus). He also explained that the particles that went straight through the foil did so because the atom is mostly empty space and that the distance between electrons and the nucleus is vast compared to the size of the nucle ...

... what is to be offered through this? Many recreational activities I presume, but what about our biggest environmental concern - pollution. Pollution is so widespread throughout our world that it is overwhelming. Drinking water supplies are contaminated with runoff from nearby factories and even with pollutants from our own backyards. Demands of skyscrapers and condominiums wipe out our decreasing rainforests. This drudges wildlife from its natural home and into the havoc that is ours. Millions of acres of beautiful land are destroyed daily to satisfy the needs of mankind. But has anyone contemplated the needs o ...

... motion between a magnet and a coil. The changing flux induces an emf, which produces a current in the coil; and this induced current produces its own magnet field. If the distance between the coil and the magnet decreases; so the magnetic field, and therefore the flux, through the coil increases. The magnetic field of the magnet points upward. To oppose this upward increase, the field produced by the induced current must point downward. Thus Lenz's law tells us that the current must move by the use of the use of the right hand rule. If the flux decreases, so the induced current produces an upward magnetic field tha ...

... to is a result of natural causes, sulfur dioxide from oil and coal combustion and nitrogen oxides produced from automobile engines have greatly intensified the problem. Winds can carry the pollutants thousands of kilometers away from their source. The British government has recognized that sulfur emissions from power plants in the United Kingdom are contributing to acid deposition in Scandinavia. Canadian emissions contribute substantially to in the northeastern United States, for example, and much of the sulfur falling in eastern Canada is believed to originate in the United States. In 1986 the U.S. National ...

... the developmental years; especially in the aspects of cognitive motor and social/ behavioral deficiencies. Cognitive deficiencies are those that deal with an individual’s thinking and reasoning process. These abilities are seen in the beginning school years, not at birth, but are the subtle characteristics that only through the school environment can be recognized. In a class environment, the deficiencies of a cocaine child are often confused with those of a disruptive child. The underlying truth is: teachers are not able to cope with them on an individual basis and give them more attention. An initial sign th ...

... a white or brownish powder. There is also a form that is black and sticky known on the streets as “black tar heroin�. Opiates are drugs that are derived from a naturally occurring substance found in the poppy plant. Although the purity of the heroin that reaches the streets is becoming greater, most street heroin is cut or diluted. Usually this is done with another drug, or a substance such as sugar, starch, powdered milk, or quinine. Street heroin can also be cut with strychnine or other poisons. The reason heroin is one of the most deadly drugs is because there are varying rates at which the drug is dilut ...

... Rainforests across the world are being destroyed everyday. These rainforests are being destroyed by human efforts which are centred around greed. Oil companines drilling for oil, logging companies, and fires are the leading causes in destroying the last Nigerian Rainforest. Rainforests cover only two percent of the entire earth’s surface.1 It is estimated that ninety-five percent of Nigeria’s rainforest has been destroyed. A Hong Kong company is logging out of Nigeria for the use of ply-wood, toothpicks, veneer, and chopsticks.2 People need to become more educated about the importance o ...

... to stop, and which direction to go. When he sleeps, everyone else is supposed to be sleeping to, and then he gives a signal to wake up. When the old silverback gets too old, then his eldest son usually is the one to take over. The females are usually responsible for the nursing portion in the unit. Gorillas are peaceful and tolerant by nature. Whenever two groups meet, they either ignore each other, or they give each other a grumpy grunt. Sometimes the two groups would even stay together, and then eventually separate. There are many rumors about gorillas being very violent, but there are no reports about it ...