Polymerase chain reaction (PCR) is a laboratory technique used to amplify DNA sequences. The method involves using short DNA sequences called primers to select the portion of the genome to be amplified.olymerase chain reaction (PCR) is a laboratory technique used to amplify DNA sequences. The method involves using short DNA sequences called primers to select the portion of the genome to be amplified.
The smallest possible size for anything in the universe is the Planck Length, which is 1.6 x10-35 m across.
This means that the distance where the brightness of the candle is at the minimum brightness visible to a human eye is 70,000 meters, or 70 kilometers, or about 43 miles. This distance seems rather large, but keep in mind that this is a theoretical maximum distance.