Our ability to sequence, synthesize, and edit DNA has advanced at a previously inconceivable speed. Far from being expensive and impractical, these DNA technologies are the most disruptive in all of biotechnology. It’s now possible to write custom DNA strands for pennies per base pair, at least for short strands. Two companies, GenScript Biotech Corp. and Integrated DNA Technologies, provide DNA synthesis for 11 and 37 cents per base pair, respectively, for strands no longer than several hundred base pairs. Biotech startup companies buy their services and use the synthesized DNA to repair organs or create yeasts that produce unusual flavors to use in brewing beer.