There are many kinds of scientists, corresponding to a different variety of branches of the various scientific disciplines, like physical or biological science, earth science, medicine, engineering and social science. Scientists study a wide variety of subjects. Some scientists may study the laws of nature that govern the extra-terrestrial phenomena that occurs in outer space, this is referred to as astronomers.
An input device sends information to a computer system for processing, and an output device reproduces or displays the results of that processing. Depending on the interaction, a device can be both, referred to as an input/output or I/O device. An input device can send data to another device, but it cannot receive data from another device. Examples of an input device include a computer keyboard and mouse, which can send data (input) to the computer, but they cannot receive or reproduce information (output) from the computer. An output device can receive data from another device, but it cannot send data to another device. Examples of an output device include a computer monitor, projector, and speakers, which can receive data (output) from the computer, but they cannot send information (input) to the computer. An input/output device can send data to another device and also receive data from another device. Examples of an input/output include a computer CD-RW drive and USB flash drive...
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