News. The invention of the Polymerase Chain Reaction (PCR) radically changed biology. The technique was considered so important that the Nobel Prize was awarded to its inventor, Kary Mullis, in 1993.Thanks to this technique, very small samples of DNA (from as little as a single cell) can be analyzed.ews. The invention of the Polymerase Chain Reaction (PCR) radically changed biology. The technique was considered so important that the Nobel Prize was awarded to its inventor, Kary Mullis, in 1993.
The smallest prime number, according to primality as defined by modern mathematicians, is 2. To be prime, a number must be divisible only by itself and 1. All other numbers are known as composites.
â¢ 4 is the only composite number that is equal to the sum of its prime factors. â¢ 4 is the only composite number n which doesn't divide (n-1)! 5 (unique numbers) â¢ 5 is the smallest number of queens needed to attack every square on a standard chess board. â¢ 5 is the only prime which is the difference of two squares of primes. â¢ 5 is the only prime that is a member of 2 pairs of twin primes.