what is autocad by azhar khan
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history of computer computer by azhar khan
When was the first computer invented? There is no easy answer to this question due to the many different classifications of computers . The first mechanical computer, created by Charles Babbage in 1822 , doesn't really resemble what most would consider a computer today. Therefore, this document has been created with a listing of each of the computer firsts, starting with the Difference Engine and leading up to the computers we use today. Note: Early inventions which helped lead up to the computer, such as the abacus , calculator , and tablet machines, are not accounted for in this document. The word "computer" was first used The word "computer" was first recorded as being used in 1613 and originally was used to describe a human who performed calculations or computations. The definition of a computer remained the same until the end of the 19th century, when the industrial revolution gave rise to machines whose primary purpos...
Negative and positive effects of Facebook by azhar khan
Negative and positive effects of Facebook in teens If you are young and love Facebook , keep it to just liking and minimise your virtual circle of friends to cut the upcoming depression risk . According to researchers, the social networking site can have positive and negative effects on the levels of a common stress hormone in teenagers. The team found that having more than 300 Facebook friends increased teenagers' levels of cortisol while those who only posted A"likesA" on their Facebook friends to encourage them actually decreased their cortisol levels. A"We were able to show that beyond 300 Facebook friends, adolescents showed higher cortisol levels. We can imagine that those who have 1,000 or 2,000 friends on Facebook may be subjected to even greater stress,A" explained Professor Sonia Lupien from University of Montreal. "While other important external factors are also responsible, we estimated that the isolated effect of Faceb...
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