Examlex
By 1900,in both the North and South:
Radio
A technology that uses radio waves to transmit information, such as sound, by modulating properties of electromagnetic energy waves transmitted through space.
Satellite
A man-made object that is launched to circle around the earth or another celestial body, used for gathering data or for communication purposes.
Microwave
An electromagnetic wave with a wavelength shorter than that of a normal radio wave but longer than those of infrared radiation, commonly used in microwave ovens to heat food.
Fiber
A type of material used in the transmission of data as light signals through thin strands of glass or plastic, offering high-speed internet connectivity.
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