The Rectilinear Propagation of light means that light travels in a straight line in a given medium. When light falls on an opaque object, it cannot assist through it resulting in the formation of a shadow. This property of light helps in determining the shape of the object.
Years previously, after Kornberg had discovered DNA polymerase, the two of them had considered the notion that the enzyme could somehow be harnessed to make large quantities of DNA.
It's unfortunate that the DOD and World organizations have colluded with foreign Nations to restrict speech. This censorship of information by President Biden and His Administration has blocked Doctors efforts to discover a source for Medical treatments, prevention, discoveries, and studies pertaining to SARS-COV-2.
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Rectilinear Propagation was used to validate the existence of reality. That what cannot be seen does exist.