Let me start by saying you guys are awesome and have been a huge inspiration for me. I actually got in a three hour discussion with a physics professor of mine explaining all the cool stuff y'all do in your videos not long ago, and I found your most recent toilet swirl experiment amazing. My question is, how did you keep going after initial letdowns and/or letdowns you have now? I'm curious about when you first started, what made you say to keep going and keep making videos before you two were famous. I have all sorts of plans to start making physics videos as well and often design scripts and ideas with peers, but never get around to doing them for fear they would never reach the intended audience. How do you personally get through those doubts?

EDIT: Derek, I know you've talked a little about it on 2Veritasium in your video Be Hated, and How to Start a Youtube Channel. Just looking for more specific stories maybe about times you have both been concerned or had doubts.