The majority of Americans drink at least one cup of coffee every day. The kinds of drinks and the companies producing them have changed dramatically over the past few decades. Consumers increasingly want their caffeine kick to be gourmet and iced. Meanwhile, artisanal coffee companies are being snatched up by big roasters, much as craft brewers have been acquired by bigger counterparts. This week on Material World, Jenny and Lindsey dig into what's happening with the country's favorite stimulant. They talk with the leaders of Illycaffe Spa, La Colombe Coffee Roasters and Blue Bottle Coffee Co. about why gourmet coffee is growing, how cold drinks got so hot and why industry consolidation is expected to continue.