Sunday, March 23, 2008

Mobile Phone Radiation and Health

Since the beginning of mobile phones, apprehensions have been raised about the potential health forces from regular use. As mobile phone penetrations grew past fixed landline penetration levels in 1998 in Finland and from 1999 in Sweden, Denmark and Norway, the Scandinavian health authorities have run permanent long term studies of effects of mobile phone radiation effects to humans, and in particular children. Numerous studies have reported no significant relationship among mobile phone use and health. Studies from the Institute of Cancer Research, National Cancer Institute and researchers at the Danish Institute of Cancer Epidemiology in Copenhagen for model showed no link between mobile phone use and cancer. The Danish study only covered analog mobile phone tradition up through 1995, and subjects who started mobile phone tradition after 1995 were counted as non-users in the study. The health concerns have grown as mobile phone saturation rates throughout Europe reached 80%–90% levels earlier in this decade and prolonged experience studies have been carried out in almost all European countries again most reporting no effect, and the most alarming studies only coverage a possible effect. However, a study by the International Agency for Research on Cancer of 4,500 users found a borderline statistically important link between tumor frequency on the same side of the head as the mobile phone was used on and mobile phone usage.

Sunday, March 16, 2008

The Telephone

The telephone is a telecommunications device that is used to transmit and receive sound (most commonly speech), generally two people conversing but occasionally three or more. It is one of the most universal household appliances in the world today. Most telephones operate through transmission of electric signals over a complex telephone network which allows almost any phone user to communicate with almost anyone.

Sunday, March 09, 2008


An ice age is a period of long-term downturn in the temperature of Earth's climate, resulting in an increase of the continental ice sheets, polar ice sheets and mountain glaciers. Glaciologically, ice age is often used to mean a period of ice sheets in the northern and southern hemispheres; by this description we are still in an ice age. More colloquially, when speaking of the most recent few million years, ice age is used to refer to colder periods with extensive ice sheets over the North American and European continents: in this sense, the last ice age ended about 10,000 years ago. This article will use the term ice age in the former, glaciological, sense; and use the term 'glacial periods' for colder periods the duration of ice ages and 'interglacial' for the warmer periods.

During the last few million years, there have been many glacial periods, occurring firstly at 40,000-year frequency but more recently at 100,000-year frequencies.

Monday, March 03, 2008

Natural Science

Natural sciences form the foundation for the applied sciences. Together, the natural and applied sciences are distinguished starting the social sciences on the one hand, and from the humanities, theology and the arts on the other. Though Mathematics, statistics, and computer science are not considered natural sciences, they supply many tools and frameworks used within the natural sciences.

Alongside this established usage, the phrase natural sciences is also sometimes used more narrowly to refer to its everyday usage, that is, related to natural history. In this sense "natural sciences" may refer to the biology and perhaps also the earth sciences, as illustrious from the physical sciences, including astronomy, physics, and chemistry.

Within the natural sciences, the word hard science is sometimes used to describe those sub-fields that rely on experimental, quantifiable data or the scientific method and focus on accuracy and objectivity. These generally include physics, chemistry and many of the sub-fields of biology. By contrast, soft science is often used to explain the scientific fields that are more reliant on qualitative research, including the social sciences.

There is some explore, collectivelly known as graphism thesis, that indicates that natural science relies on graphs more than soft sciences and mathematics do.