.... an average of once every six seconds. This washes the eye with the salty secretion from the tear, or lachrymal, glands. Each tear gland is about the size and shape of an almond. These glands are located behind the upper eyelid at the outer corner of the eye. After passing over the eye, the liquid from the gland is drained into the nose through the tear duct at the inner corner of the eye. Heavy laughter or crying causes muscles in the upper eyelid to squeeze the lachrymal gland. This produces tears that flow too fast to be drained away. The eyelashes catch many flying particles that otherwise would enter the eye. As further protection, the eyelids automatically close when ....

.... and protons; leptons, which include electrons and some similar particles; and bosons, or vector mesons, which include the photons seen as light and which carry the electromagnetic force. Some scientists suggest that leptons and quarks may actually be the same object but in different states. Bosons, too, may be this same object but in still another state. The everyday world is made of molecules. Because molecules are so small, their existence was not easy to establish. Indirect evidence for molecules was strong during the second half of the 19th century, and the first explicit evidence was found when Brownian motion was correctly understood and studied in about 1906 by physici ....

.... facts. The term is usually applied to silicate-based materials, non-crystalline solids. Basically a is any material that has congealed and become firm without forming a regular crystal formation.(Russ, 1998) The properties of vary and regulate by modifying the composition, production techniques or both. represents a combination of properties that can not be separated, such as mechanical, chemical, optical and thermal properties. is an intriguing substance in the way that the moment you change the percentage of one of its components, the itself is different. (Education Dep. Properties: Chemical). Often, it can even be classified as a different type of . Com ....

.... own eyes. EXPERIMENT My experiment was not about the tiny blood vessels that you can easily see on the surface of the eye. It's to do with the larger vessels All I had to do was take a person into a dark room with my flashlight. I had them cover their left eye and look down at the floor with their right eye. I held the flashlight up towards the ceiling under their right eye, but they kept looking at the floor, not the light. RESULTS I 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 ....

.... stones (often precious) for example: chronium gives a red colour to rubies, and cobalt makes the blue in sapphires. How Aluminium deposits are formed Aluminium (like many other metals) is not found in it's pure form, but associated with other elements in rocks and minerals. An aluminosilicate such as felspar (KAlSi3O8) is the main constituent of many rocks such as granite, which is quartz and mica cemented together with felspar. These rocks are gradually weathered and broken down by the action of carbon-dioxide from the air dissolved in rainwater forming ‘kaolin'. This is further broken down to form other substances, ultimately resulting in the formation of Aluminium ....

.... The microfossil record indicates that the first eukaryotes evolved at least 1.5 billion years ago. Eukaryotes are distinguished from prokaryotes by their larger size, the separation of nucleus from cytoplasm by a nuclear envelope, the association of DNA with histone proteins and its organization into a number off distinct chromosomes, and complex organelles, among which are chloroplasts and mitochondria. Scientists believe that eukaryotic organisms such as the protists evolved from the prokaryotes. There are two main theories which describe how this transition may have occurred. The first is the endosymbiotic theory, or enosymbiosis, and the other is the autogenous ....

.... in the cell, being broken down to produce energy. Polysaccharides play an important role serving as energy reserves also. It provides a quick-release energy source that keeps us going between meals. Small amounts of carbohydrates are also used for structural purposes and others are attached to outer surfaces of cell membranes to guide cellular interactions. For many cells, sugars are the most important source of energy. Lipids are important because they function as structural components of cell membranes, sources of insulation, and a mean of energy storage. The lipid molecules are most well known as forming basic structures of cell membranes and as energy stora ....

.... but if you are infected, you can pass the virus to anyone you may have unprotected sex or share needles or syringes with. AIDS and HIV are two different viruses, but HIV well eventually turn into AIDS. About half the people with HIV develop AIDS within 10 years, but between infection with HIV, the onset for AIDS can vary greatly. The severity of the HIV related illness or illnesses will differ from person to person, according many factors but mostly to the overall health of the individual. The new advances in technology are helping postpone the advancement of the disease. Lets start at the beginning. First, lets learn what AIDS is. AIDS is an acquired defect in your im ....