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.
Put in n = 4, and the result is 24 â 1 = 15, which is not a prime number, because 15 is divisible by 3 and 5. As integers get bigger, prime numbers become rarer, but there is always a bigger prime number to be found. It is just much harder to find. In total, only 49 Mersenne primes are known.