Computer science is the subject that studies what computers can do and investigates the best ways you can solve the problems of the world with them. It is a huge field overlapping pure mathematics, engineering and many other scientific disciplines. In this video I summaries as much of the subject as I can and show how the areas are related to each other.

Many mechanical aids to calculation and measurement were constructed for astronomical and navigation use. The planisphere was a star chart invented by Abū Rayhān al-Bīrūnī in the early 11th century. 6 The astrolabe was invented in the Hellenistic world in either the 1st or 2nd centuries BC and is often attributed to Hipparchus A combination of the planisphere and dioptra , the astrolabe was effectively an analog computer capable of working out several different kinds of problems in spherical astronomy An astrolabe incorporating a mechanical calendar computer 7 8 and gear -wheels was invented by Abi Bakr of Isfahan , Persia in 1235. 9 Abū Rayhān al-Bīrūnī invented the first mechanical geared lunisolar calendar astrolabe, 10 an early fixed- wired knowledge processing machine 11 with a gear train and gear-wheels, 12 circa 1000 AD.

Duration. It is possible to finish Core CS within about 2 years if you plan carefully and devote roughly 18-22 hours/week to your studies. Courses in Core CS should be taken linearly if possible, but since a perfectly linear progression is rarely possible, each class’s prerequisites is specified so that you can design a logical but non-linear progression based on the class schedules and your own life plans.

Such computers are used as control systems for a very wide variety of industrial and consumer devices This includes simple special purpose devices like microwave ovens and remote controls , factory devices such as industrial robots and computer assisted design , but also in general purpose devices like personal computers and mobile devices such as smartphones The Internet is run on computers and it connects millions of other computers.{smartphone|smartphone price in bd|smartphone flash tool|smartphone price|smart phone watch|smartphone 2017|smart phone pic|smartphone png|smart phone ringtone|smartphone brand}

Today, there are two types of computers the PC (IBM compatible) and Apple Mac. There are dozens of companies that make and build PCs, and if you get all of the necessary parts for a computer, you can even build a custom PC. However, when it comes to Apple, only Apple designs and makes these computers. See our computer companies page for a listing of companies ( OEMs ) that make and build computers.

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