Since DNA’s discovery, molecular biology had operated on reassuring assumptions: every protein folds into one precise, stable shape; shape determines its function; and shape is determined by a sequence of amino acids produced by a sequence of DNA letters. It was a clean idea. The holy grail of bioscience for decades was finding the shapes of proteins and the DNA codes that determine that shape. It is very difficult to determine the shapes of any protein from the sequence of a

Water is the medium that makes life possible. Water is so ordinary that we rarely think of it as doing anything. But inside a living cell, water is not a passive background—it is an active participant in nearly every molecular event and every cellular structure. The water molecule has a peculiar geometry. One oxygen atom pulls so strongly on two hydrogen atoms that it ends up slightly negative, while the two hydrogens are left slightly positive, which results in four partial