The keys to the mystery have taken code-breakers on a romp that encompasses Fermi's earliest days in the 1960s, the cryptic jargon of computer programming and high-energy physics, and the power of "crowdsourcing," or unleashing a problem on the collective intelligence of an Internet community. Blog attracts 30,000 On May 15, Jackson's group released the letter on a physics blog they had launched recently, under the heading, "Code crackers wanted!" Within a day the blog post attracted 30,000 visitors, many drawn by a link from the technology news site Slashdot, self-described as "news for nerds."