One last thing about Tracy and Ben. Here’s the recording published in April 2018 (and, judging by the version of Rx used, recorded somewhere around that time). Ben is explaining to Tracy how to use RxJS for animations. The slow pace is great for a newbie (as opposed to his talks at conferences where he would fly over these concepts at a high speed). The thing is, at the time of the recording, Tracy has the title of Google Developer Expert, and is a member of RxJS Core team. From the dialog that’s going on in the recording, I can’t even... And it’s not like she is playing the role of a novice (although she makes one — and only one — uncharacteristically sharp remark when Ben is trying to import an RxJS operator from the wrong package). It’s very hard to convincingly imitate this.