DPLAA caveat first. The Digital Public Library of America is evolving. What’s more, I’m a booster of the organization and of the people behind it, including the new executive director, Dan Cohen, who so decently reacted after the Boston Marathon bombings. But for now, the academic-and-hacker mindset is prevailing at the DPLA over the traditional public library one, judging from the demo’s worthy but rather limited debut yesterday. Not necessarily a bad thing, mind you. But then, why insist on the P word in the organization’s name? Also, the K-12 appeal so far is not quite as great as I’d hoped despite some...