Photo: Owen Thomas, Business Insider
San Francisco’s Moscone centre is ground zero for big tech announcements. Apple had its annual conference for developers just last week; now it’s Google’s turn.The events have decidedly different vibes. Apple is locked down and hush-hush; Google is friendlier to the press and more open in general. But both share something in common: mobs of developers hankering to get an edge, learn something new, and walk away with some great free stuff.