and in 1983 the meter was redefined to be the distance in free space covered by light in 1/299,792,458 of a second (thus defining the speed of light to be 299,792,458 meters per second).

Natural sciences

In many sciences, from pathology to taxonomy, prototype refers to a disease, species, etc. which sets a good example for the whole category. In biology, prototype is the ancestral or primitive form of a species or other

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