Billions of years before humans developed hard drives, evolution chose DNA to store its most precious information: the genetic code. Over time DNA became so proficient at this task that every known life-form on earth uses it. With recent technological breakthroughs that allow us to easily “read” and “write” DNA, scientists are now repurposing this age-old molecule to store new types of information—the kind that humans are generating at an exponential rate in the age of big data.