The whole concept of holography, despite its scientific implications, has only been known to the physicist since the underlying mathmatical principles were worked out by Dennis Gabor in 1947 (he later won a Nobel Prize for his work).
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Pentagon (Wikipedia)In geometry, a pentagon (from Greek πέντε (pente) ‘five’ and γωνία (gonia) ‘angle’) is any five-sided polygon or 5-gon. The sum of the internal angles in a simple pentagon is 540°.