CNBC's Bob Pisani spoke with Dave Mazza, Head of product at Direxion, Jim Davalos, Research analyst and portfolio manager at Horizon Kinetics and Ben Johnson, Director of global ETF research for Morningstar. Last week was a wild one not only for the U.S. but also Russian stocks...between individual names and ETFs getting halted by exchanges and major providers like MSCI, FTSE Russell and S&P removing listings from their indexes - that's sparking a lot of debate about what qualifies as "uninvestable" right now. In the 'markets 102' portion of the podcast, Bob continues the conversation with Ben Johnson from Morningstar on lasting damage to ETF investing.