This article is ignorant. >Why nature stuck with four letters is one of biology’s fundamental questions. Computers, after all, use a binary system with just tw

This article is ignorant. >Why nature stuck with four letters is one of biology’s fundamental questions. Computers, after all, use a binary system with just two “letters” — 0s and 1s. Yet two letters probably aren’t enough to create the array of biological molecules that make up life. “If you have a two-letter code, you limit the number of combinations you get,” said Ramanarayanan Krishnamurthy, a chemist at the Scripps Research Institute in La Jolla, Calif. This simply isn't true. Even with regular DNA, the word size is 3 nucleotides long... giving you 64 instructions. If I remember my highschool biology, only some of these are even used, the rest are duplicates or unused. Binary would work too, assuming ribosomes and mRNA could expand the word size... you only need 6 bits to do the same as natural DNA. Is there something I don't know that fixes word size at 3 nucleotides?