Nowadays an integrated circuit is the main component of everyday device.
Some researchers think that we are close to a physical limit in increasing computer operation system.
. In many countries scientists interested in electricity wanted to find out whether it could be used for a long distance communication.
Communication satellites used by all countries make intercontinental television transmission possible.
Wind and solar energies available throughout the earth must be used for useful purposes.
By the end of the 20-th century a new age of light may replace the still youthful electronic age.
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