What secrets lurk in the heart of DNA? — Didn’t the Human Genome Project answer that question? Think again. Last week, scientists involved in a project called Encode reported on a detailed analysis of one percent of the genome, and the findings have undercut a host of conventional wisdom about how genes and DNA work. Most notably, the Encode study suggests that much of the genome — the long stretches of seemingly inactive genetic “letters” surrounding functional genes, sometimes unfairly called “junk DNA” — is actually a beehive of complex and little-understood activity.