John Dalton was an English chemist who pioneered in the study of modern atomic theory while Joseph Lister was a surgeon who introduced the new principles of cleanliness. The impact of the scientific theory that Dalton introduced may be very molecular in level however that of Lister is very much applicable in day-to-day basis.
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Infrastructure can be described as a term used for the physical systems of a society or country. It includes the buildings, roads, power supplies, electricity etc of a society or a country. The infrastructure of a country is very crucial for its development. There are many social changes which are brought by infrastructure.
<em>One of the social change is the economy of a country.</em>
Infrastructure can raise the economy of a society or country by providing jobs for construction and maintenance of the construction projects. Infrastructure such as roads makes it possible to travel from one part to another and hence increase business. Infrastructure such as better roads also allows for family members to visit one another easily. Through infrastructure, a community is connected to a city, schools, hospitals etc. Hence, through infrastructure such as transportation and telecommunication the economy of a country can be made better.
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<u>Definition: </u>
Speed of light, speed at which light waves propagate through different materials. In particular, the value for the speed of light in a vacuum is now defined as exactly 299,792,458 metres per second.
<u>Calculation:</u>
Formula: c = f where: c = the speed of light = 300,000 km/s or 3.0 x 108 m/s. = the wavelength of light, usually measured in meters or Ångströms (1 Å = 10-10 m)
Explanation:
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Cats are thought to have been brought to Europe by Phoenician traders who smuggled them out of Egypt. ... It is well documented that cats were kept on ships to control vermin during the time of the 15th century CE Age of Discovery and, most likely, they served the same purpose for the Phoenicians.
Archaeologists once believed that cats were domesticated in the time of the pharaohs in ancient Egypt, approximately 4,000 years ago, between 2310 B.C. and 1950 B.C. But in 2004, researchers reported a 9,500-year-old joint burial of a cat and a human on the island of Cyprus.
The economic problem faced by the countries in Southern Europe, specifically Portugal, Spain, Italy and Greece is due mainly to illiteracy and the low standard of their educational system. Ranking of mastery in mathematics among eighth graders showed that the Southern Europeans come close to the bottom. The lack of education leads to high unemployment and unsustainable standards of living. In Italy and Greece, the other causes are poor business environment and high level of corruption.
