Wednesday, March 26, 2008

Special glasses

The fantasy of three dimensions on a two dimensional surface can be created by providing each eye with different visual information. Classic 3D glasses make the illusion of three dimensions when viewing specially prepared images. The typical 3D glasses have one red lens and one blue lens. 3D glasses prepared of cardboard and plastic are distributed at 3D movies. Another type of 3D glasses uses polarized filters. One type of electronic 3D spectacles uses electronic shutters.Virtual reality glasses and helmets have separate video screens for each eye and a method for formative the direction the head is turned.

Wednesday, March 19, 2008

Scientific Methods

The scientific method seeks to explain the complexities of nature in a replicable way, and to use these explanations to construct useful predictions. It provides an objective method to find solutions to problems in a number of scientific and technological fields. Often scientists have a predilection for one outcome over another, and scientists are conscientious that it is vital that this preference does not bias their interpretation. A strict following of the scientific method attempts to minimize the pressure of a scientist's bias on the outcome of an experiment. This can be achieved by correct experimental design, and a thorough peer assessment of the experimental results as well as conclusions of a study.

Scientists use models to refer to a explanation or depiction of something, specifically one which can be used to construct predictions that can be tested by experiment or observation. A hypothesis is a disputation that has been neither well supported nor yet ruled out by experiment. A theory, in the context of science, is a logically self-consistent model or framework for recitation the behavior of certain natural phenomena. A theory typically describes the behavior of much broader sets of phenomena than a hypothesis — commonly, a large number of hypotheses may be logically bound together by a single theory. A physical law or law of nature is a scientific generalization based on a adequately large number of empirical observations that it is taken as fully verified.

Sunday, March 09, 2008

Prevention

In medicine, prevention is any action which reduces the burden of humanity or morbidity from illness. This takes place at primary, secondary and tertiary prevention levels.

Primary prevention avoids the growth of a disease. Most population-based health support actions are primary preventive measures.Secondary prevention activities are intended at early disease detection, thereby increasing opportunities for interventions to prevent progression of the disease and emergence of symptoms.Tertiary prevention reduces the negative impact of an already recognized disease by restoring function and dipping disease-related complications.