While exchange-traded funds have become increasingly popular and people are more familiar with them, there are still aspects of ETFs that—for some—remain shrouded in mystery. So we recently asked our followers on social media to send us any ETF questions they may have or topics they were curious about. We received a ton of responses.  On this episode of Trillions, Joel Weber and Eric Balchunas answer about 20 of these questions—ranging from whether ETFs will be in 401(k) plans someday to how overnight trading works to our thoughts on some of the new iterations of ETFs, like buffers, return stacking and crypto.  See omnystudio.com/listener for privacy information.