.... interior—and the other four are surface waves. The waves are further differentiated by the kinds of motions they impart to rock particles. Primary or compressional waves (P waves) send particles oscillating back and forth in the same direction as the waves are traveling, whereas secondary or transverse shear waves (S waves) impart vibrations perpendicular to their direction of travel. P waves always travel at higher velocities than S waves, so whenever an earthquake occurs, P waves are the first to arrive and to be recorded at geophysical research stations worldwide.(Associated Press 199 .....

.... particles irrespective of the metal the electrodes were made of or the kind of gas in the tube. In 1909, RA Millikan, an American scientist, measured that charge. All electrons are found to be identical no matter their source or the method of liberating them from matter. From the values of e/m, and e, the mass of an electron was calculated to be .00055 amu. PROTON- Eugeen Goldstein used a Crookes tube with holes in the cathode, and observed that another kind of ray was emitted from the anode and passed through the holes. He discovered this in 1886. In 1889, William Wien showed these .....

.... to 5,000 pages of double-spaced typed information, into a device the size of a small shoebox. At the time, a storage capacity of 10 MB was considered too large for a so-called "personal" computer. The first PCs used removable floppy disks as storage devices almost exclusively. The term "floppy" accurately fit the earliest 8-inch PC diskettes and the 5.25-inch diskettes that succeeded them. The inner disk that holds the data usually is made of Mylar and coated with a magnetic oxide, and the outer, plastic cover, bends easily. The inner disk of today’s smaller, 3.5-inch floppies is .....

.... occupy a territory of 200 square miles. When there is enough food, the tiger lives in a much smaller territorty. It lives in the forest, the grassland, or the swamps. The tiger attacks a variety of prey, mainly deer, antelopes, pigs and buffalo. Once in awhile, it will attack cattle and even humans. There are many stories about the evils done by "man-eating" tigers. They're usually old tigers that are sick or wounded, and cannot hunt normally. The destruction of their usual prey may also cause them to attack humans. As soon as the tiger spots prey, it begins a slow and silent approach. Whe .....

.... other minds ponder the new Heliocentric theory. After Copernicus's death there were three other scientists which helped credit the Heliocentric theory. Tycho Brahe was the first, he played with the idea that the planets all revolved around the sun, but the sun instead revolved around the Earth(still Geocentric). After Brahe's death Johannes Kepler took the notes and data that Brahe had taken. Kepler came up with the idea the it would be even more mathematically plausible that the orbits of the planets around the sun (Heliocentric) were elliptical, instead of circular and published .....

.... number of 46. This extra sex (X) chromosome causes the distinctive make-up of these boys. All men have one X chromosome and one Y chromosome, but sometimes a variation will result in a male with an extra X. This is Klinefelter Syndrome and is often written as 47,XXY. There are other, less common variations such as 48,XXYY; 48,XXXY; 49,XXXXY; and XY/XXY mosaic. All of these are considered Klinefelter Syndrome variants. The major effect of the extra X chromosome in boys with Klinefelter Syndrome seems to be the function of the testes. The testes produce the major male sex hormone testoster .....

.... is becoming obvious we cannot force Europeans to take such products, even though Canada and the U.S. are using the World Trade Organization (WTO) in an effort to do so. Most large European and British supermarket chains have removed GE products from their shelves, and the largest European food processors (Nestle and Unilever) will no longer use GM products. All this is being reflected in the market -- non-GM foods are now selling at a higher price than genetically altered crops. And there is a scramble by farmers to find non-GM seed for planting next year -- there may not be enough t .....

.... effective use of radar since an antenna could be carried on aircraft, ships and mobile ground stations. This characteristic of microwaves, the efficiency with which they are concentrated in a narrow beam, is one reason why they can be used in cooking. You can produce a high-powered microwave beam in a small oven, but you can't do the same with radio waves, which are simply too long. Microwaves and their Use The idea of cooking with radiation may seem like a fairly new one, but in fact it reaches back thousands of years. Ever since mastering fire, man has cooked with infrared radiation .....

.... is linked to an inner, light-sensitive circadian rhythm. In the temperate zones, day lengths during the natural 24-hour cycle vary with the seasons. In winter and spring, the period of light lengthens; in summer and autumn, it shortens. Plants in these zones undergo alternate 12-hour phases of light sensitivity. During one 12-hour phase, decreasing exposure to light induces a short-day reaction. For example, deciduous trees under the influence of the shorter days of fall drop their leaves. During the other 12-hour phase, more exposure to light creates a long-day reaction. Deciduous t .....

.... he bombarded a sample of Uranium with deuterons, the nuclei in atoms of deuterium, transmuting it into plutonium. Shortly after, Seaborg was able to isolate plutonium 239, an isotope used in atomic bombs. Plutonium is a highly dangerous and poisonous element because it rapidly gives off radiation in the form of alpha particles. Alpha particles, which are identical to the nucleus of a helium atom, consist of two protons and two neutrons tightly bound together. Although the particles can only travel about five centimeters in the air, they can cause great damage when the enter the body, .....