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Joining WGN’s Bob Sirott and Marianne Murciano on today’s Wintrust Business Lunch: John Carpenter of the Tribune’s ‘Blue Sky Innovation’ with new developments in 3-D printing.  Johnny Jet lets you know where you can find cheap airfare for your last-minute summer vacation. Traveling this holiday weekend? Scott Kleinberg from the Tribune’s ‘So Social’ highlights Google Maps’ new update, and Front Row Phyllis looks at this weekend’s hot concerts and shows.