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.
Thousands of years later, when some of these Himalayan Rivers became non-perennial or started drying up, some of these people started moving towards Central Asia and Europe.
As per ecologists this ecological cycle has been repeating itself and will get repeated after every ice age and during the beginnings of all Holocene cycles.
More sophisticated electrical machines did specialized analog calculations in the early 20th century.
The first digital electronic calculating machines were developed during World War II.
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Therefore the history of growth of civilization in the world is not 4 to 5 thousand years old but it is more than 10,000 years old.
So far history of the world, particularly of Indian subcontinent, is based on linguistic guesswork and religious beliefs/hearsay.
Therefore some people started travelling from south to north.