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.

Chemists Expand Nature's Genetic Alphabet : Shots - Health News DNA's instructions are written in a code of four molecular "letters," labeled A, C, T and G. For the first time, researchers have ...

Letters are limited to less than 250 words and must be signed (no pseudonyms nor initials).You must include your email address, address with city and daytime phone number for verification.

Discovering Nature's Alphabet Krystina Castella, Brian Boyl, . . Heyday, $15.95 (0pp) ISBN 978-1-59714-021-8 ...

Your article “DNA Referees” [by Amber Dance, May 3] is very informative about epigenetic influences on gene expression, i.e., the study of how the environment can turn genes “on” and ...

Eventually, nature will win. Let’s combine to make a much better team. Phyllis Molloff, Camarillo.. To the editor: I lived in Los Angeles for nearly two decades, and frequent trips to picture ...

Formal letters differ in some key ways from e-mail and even from professional memos. The purpose of a formal letter is often serious: It may be a formal application for a job, a formal statement ...

Nature - Free-hand Lettering; being a Treatise on Plain Lettering from the Practical Standpoint for Use in Engineering Schools and Colleges Skip to main content Thank you for visiting nature.com.

Toxic nature of competition — not just sports — in Colorado schools must be fixed (Letters) Also, appreciating the Dolores River ...

Steven Greenberg (Letters, Dec. 13) may concoct an alternate reality as justification for the oppressors, but in TV footage ... Area development rapidly depleting nature.

Culture The surprisingly erotic (and poetic) nature of the Hebrew alphabet In the transcendent work of ‘genius’ poet Peter Cole, sometimes male and female letters just want to hook up ...