The Dow jumped 466 points to kick off the week and Jim Cramer is breaking down today's top news stories and how the market reacted. Then, after the announcement of their acquisition of biotech MyoKardia, Bristol Myers CEO Dr. Giovanni Caforio checks in to take a closer look at what's in the pipeline and where the company's headed. Next, Slack CEO Stewart Butterfield talks about the work-from-home movement and how it's impacting the company.