A fan video by Veritasium at the BrainSTEM un-conference. It's where science YouTubers bumped elbows in Waterloo, Ontario, Canada. Instigated by Henry of MinutePhysics, this event brought together the most awesome STEM personalities from around the world. (What, no Potholer? Or Vi Hart's face? Or CGP Grey's hands?)
There will be collaborations to come out of this.