Ever wonder why it’s so hard to speak on a conference call when you hear an echo?  This video from the excellent YouTube Channel The Modern Rogue shows how a slight delay in hearing your own voice can sometimes be like a “speech jammer.”  I hope you’ll think of this video the next time you’re on a conference call and make sure that you have muted your line so you don’t inadvertently jam the speaker.  (Also, please don’t use this technique nefariously…)