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A potential breakthrough for Biogen, Caterpillar bounces back, good news for Apple - plus e-mail habits for the very nervous - in today's Rapid Fire!

Biogen's CEO is "reasonably confident" the company's Alzheimer's drug will be approved, Caterpillar bounces back after a rough earnings report, Apple gets a price hike and good news on Apple Pay -- plus work e-mail habits for the extremely nervous. Contessa Brewer, Seema Mody and Meg Tirrell join Kelly Evans for a blockbuster Rapid Fire!

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