The Dow closed down 250 points and Jim Cramer is guiding investors through today's downturn. Then, Emerson Electric announced today it will merge two of its industrial software businesses with Aspen Technology, but what does the move mean for investors? CEO Lal Karsanbhai is breaking down the deal. Then, ahead of Thursday's event to lay out the future of the hydrogen space, Plug Power CEO Andy Marsh sits down with Cramer to talk more about the possibility of a hydrogen-powered future. Plus, Cramer's digging deeper into JFrog and Datadog and giving you his take on the two software names.